---

java.io
Class ObjectInputStream

java.lang.Object
 |
 +--java.io.InputStream
 |
 +--java.io.ObjectInputStream

All Implemented Interfaces:

DataInput, ObjectInput, ObjectStreamConstants

Direct Known Subclasses:

UnserializationStream

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public class ObjectInputStream

extends InputStream

implements ObjectInput, ObjectStreamConstants

Untamed:

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NULL_HANDLE

private static final int NULL_HANDLE

handle value representing null

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unsharedMarker

private static final Object unsharedMarker

marker for unshared objects in internal handle table

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primClasses

private static final HashMap primClasses

table mapping primitive type names to corresponding class objects

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subclassAudits

private static final sun.misc.SoftCache subclassAudits

cache of subclass security audit results

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bin

private final java.io.ObjectInputStream.BlockDataInputStream bin

filter stream for handling block data conversion

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vlist

private final java.io.ObjectInputStream.ValidationList vlist

validation callback list

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depth

private int depth

recursion depth

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closed

private boolean closed

whether stream is closed

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handles

private final java.io.ObjectInputStream.HandleTable handles

wire handle -> obj/exception map

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passHandle

private int passHandle

scratch field for passing handle values up/down call stack

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defaultDataEnd

private boolean defaultDataEnd

flag set when at end of field value block with no TC_ENDBLOCKDATA

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primVals

private byte[] primVals

buffer for reading primitive field values

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enableOverride

private final boolean enableOverride

if true, invoke readObjectOverride() instead of readObject()

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enableResolve

private boolean enableResolve

if true, invoke resolveObject()

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curObj

private Object curObj

object currently being deserialized

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curDesc

private ObjectStreamClass curDesc

descriptor for current class (null if in readExternal())

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curGet

private java.io.ObjectInputStream.GetFieldImpl curGet

current GetField object

ObjectInputStream

public ObjectInputStream(InputStream in)
 throws IOException

Enabled: Creates an ObjectInputStream that reads from the specified InputStream. A serialization stream header is read from the stream and verified. This constructor will block until the corresponding ObjectOutputStream has written and flushed the header.

If a security manager is installed, this constructor will check for the "enableSubclassImplementation" SerializablePermission when invoked directly or indirectly by the constructor of a subclass which overrides the ObjectInputStream.readFields or ObjectInputStream.readUnshared methods.

Parameters:

in - input stream to read from

Throws:

StreamCorruptedException - if the stream header is incorrect

IOException - if an I/O error occurs while reading stream header

SecurityException - if untrusted subclass illegally overrides security-sensitive methods

NullPointerException - if in is null

See Also:

ObjectInputStream(), readFields(), ObjectOutputStream.ObjectOutputStream(OutputStream)

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ObjectInputStream

protected ObjectInputStream()
 throws IOException,
 SecurityException

Provide a way for subclasses that are completely reimplementing ObjectInputStream to not have to allocate private data just used by this implementation of ObjectInputStream.

If there is a security manager installed, this method first calls the security manager's checkPermission method with the SerializablePermission("enableSubclassImplementation") permission to ensure it's ok to enable subclassing.

Throws:

SecurityException - if a security manager exists and its checkPermission method denies enabling subclassing.

IOException

See Also:

SecurityManager.checkPermission(java.security.Permission), java.io.SerializablePermission

readObject

public final Object readObject()
 throws IOException,
 ClassNotFoundException

Enabled: Read an object from the ObjectInputStream. The class of the object, the signature of the class, and the values of the non-transient and non-static fields of the class and all of its supertypes are read. Default deserializing for a class can be overriden using the writeObject and readObject methods. Objects referenced by this object are read transitively so that a complete equivalent graph of objects is reconstructed by readObject.

The root object is completly restored when all of its fields and the objects it references are completely restored. At this point the object validation callbacks are executed in order based on their registered priorities. The callbacks are registered by objects (in the readObject special methods) as they are individually restored.

Exceptions are thrown for problems with the InputStream and for classes that should not be deserialized. All exceptions are fatal to the InputStream and leave it in an indeterminate state; it is up to the caller to ignore or recover the stream state.

Specified by:

readObject in interface ObjectInput

Returns:

the object read from the stream

Throws:

ClassNotFoundException - Class of a serialized object cannot be found.

InvalidClassException - Something is wrong with a class used by serialization.

StreamCorruptedException - Control information in the stream is inconsistent.

OptionalDataException - Primitive data was found in the stream instead of objects.

IOException - Any of the usual Input/Output related exceptions.

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readObjectOverride

protected Object readObjectOverride()
 throws IOException,
 ClassNotFoundException

This method is called by trusted subclasses of ObjectOutputStream that constructed ObjectOutputStream using the protected no-arg constructor. The subclass is expected to provide an override method with the modifier "final".

Returns:

the Object read from the stream.

Throws:

ClassNotFoundException - Class definition of a serialized object cannot be found.

OptionalDataException - Primitive data was found in the stream instead of objects.

IOException - if I/O errors occurred while reading from the underlying stream

Since:

1.2

See Also:

ObjectInputStream(), readObject()

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readUnshared

public Object readUnshared()
 throws IOException,
 ClassNotFoundException

Enabled: Reads an "unshared" object from the ObjectInputStream. This method is identical to readObject, except that it prevents subsequent calls to readObject and readUnshared from returning additional references to the deserialized instance obtained via this call. Specifically:

• If readUnshared is called to deserialize a back-reference (the stream representation of an object which has been written previously to the stream), an ObjectStreamException will be thrown.
• If readUnshared returns successfully, then any subsequent attempts to deserialize back-references to the stream handle deserialized by readUnshared will cause an ObjectStreamException to be thrown.

Deserializing an object via readUnshared invalidates the stream handle associated with the returned object. Note that this in itself does not always guarantee that the reference returned by readUnshared is unique; the deserialized object may define a readResolve method which returns an object visible to other parties, or readUnshared may return a Class object obtainable elsewhere in the stream or through external means.

However, for objects which are not instances of java.lang.Class and do not define readResolve methods, readUnshared guarantees that the returned object reference is unique and cannot be obtained a second time from the ObjectInputStream that created it, even if the underlying data stream has been manipulated. This guarantee applies only to the base-level object returned by readUnshared, and not to any transitively referenced sub-objects in the returned object graph.

ObjectInputStream subclasses which override this method can only be constructed in security contexts possessing the "enableSubclassImplementation" SerializablePermission; any attempt to instantiate such a subclass without this permission will cause a SecurityException to be thrown.

Returns:

reference to deserialized object

Throws:

ClassNotFoundException - if class of an object to deserialize cannot be found

StreamCorruptedException - if control information in the stream is inconsistent

ObjectStreamException - if object to deserialize has already appeared in stream

OptionalDataException - if primitive data is next in stream

IOException - if an I/O error occurs during deserialization

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defaultReadObject

public void defaultReadObject()
 throws IOException,
 ClassNotFoundException

Enabled: Read the non-static and non-transient fields of the current class from this stream. This may only be called from the readObject method of the class being deserialized. It will throw the NotActiveException if it is called otherwise.

Throws:

ClassNotFoundException - if the class of a serialized object could not be found.

IOException - if an I/O error occurs.

NotActiveException - if the stream is not currently reading objects.

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readFields

public java.io.ObjectInputStream.GetField readFields()
 throws IOException,
 ClassNotFoundException

Enabled: Reads the persistent fields from the stream and makes them available by name.

Returns:

the GetField object representing the persistent fields of the object being deserialized

Throws:

ClassNotFoundException - if the class of a serialized object could not be found.

IOException - if an I/O error occurs.

NotActiveException - if the stream is not currently reading objects.

Since:

1.2

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registerValidation

public void registerValidation(ObjectInputValidation obj,
 int prio)
 throws NotActiveException,
 InvalidObjectException

Enabled: Register an object to be validated before the graph is returned. While similar to resolveObject these validations are called after the entire graph has been reconstituted. Typically, a readObject method will register the object with the stream so that when all of the objects are restored a final set of validations can be performed.

Parameters:

obj - the object to receive the validation callback.

prio - controls the order of callbacks;zero is a good default. Use higher numbers to be called back earlier, lower numbers for later callbacks. Within a priority, callbacks are processed in no particular order.

Throws:

NotActiveException - The stream is not currently reading objects so it is invalid to register a callback.

InvalidObjectException - The validation object is null.

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resolveClass

protected Class resolveClass(ObjectStreamClass desc)
 throws IOException,
 ClassNotFoundException

Load the local class equivalent of the specified stream class description. Subclasses may implement this method to allow classes to be fetched from an alternate source.

The corresponding method in ObjectOutputStream is annotateClass. This method will be invoked only once for each unique class in the stream. This method can be implemented by subclasses to use an alternate loading mechanism but must return a Class object. Once returned, the serialVersionUID of the class is compared to the serialVersionUID of the serialized class. If there is a mismatch, the deserialization fails and an exception is raised.

By default the class name is resolved relative to the class that called readObject.

Parameters:

desc - an instance of class ObjectStreamClass

Returns:

a Class object corresponding to desc

Throws:

IOException - any of the usual input/output exceptions

ClassNotFoundException - if class of a serialized object cannot be found

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resolveProxyClass

protected Class resolveProxyClass(String[] interfaces)
 throws IOException,
 ClassNotFoundException

Returns a proxy class that implements the interfaces named in a proxy class descriptor; subclasses may implement this method to read custom data from the stream along with the descriptors for dynamic proxy classes, allowing them to use an alternate loading mechanism for the interfaces and the proxy class.

This method is called exactly once for each unique proxy class descriptor in the stream.

The corresponding method in ObjectOutputStream is annotateProxyClass. For a given subclass of ObjectInputStream that overrides this method, the annotateProxyClass method in the corresponding subclass of ObjectOutputStream must write any data or objects read by this method.

The default implementation of this method in ObjectInputStream returns the result of calling Proxy.getProxyClass with the list of Class objects for the interfaces that are named in the interfaces parameter. The Class object for each interface name i is the value returned by calling

 Class.forName(i, false, loader)
 

where loader is that of the first non-null class loader up the execution stack, or null if no non-null class loaders are on the stack (the same class loader choice used by the resolveClass method). Unless any of the resolved interfaces are non-public, this same value of loader is also the class loader passed to Proxy.getProxyClass; if non-public interfaces are present, their class loader is passed instead (if more than one non-public interface class loader is encountered, an IllegalAccessError is thrown). If Proxy.getProxyClass throws an IllegalArgumentException, resolveProxyClass will throw a ClassNotFoundException containing the IllegalArgumentException.

Parameters:

interfaces - the list of interface names that were deserialized in the proxy class descriptor

Returns:

a proxy class for the specified interfaces

Throws:

IOException - any exception thrown by the underlying InputStream

ClassNotFoundException - if the proxy class or any of the named interfaces could not be found

Since:

1.3

See Also:

ObjectOutputStream.annotateProxyClass(Class)

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resolveObject

protected Object resolveObject(Object obj)
 throws IOException

This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization. Replacing objects is disabled until enableResolveObject is called. The enableResolveObject method checks that the stream requesting to resolve object can be trusted. Every reference to serializable objects is passed to resolveObject. To insure that the private state of objects is not unintentionally exposed only trusted streams may use resolveObject.

This method is called after an object has been read but before it is returned from readObject. The default resolveObject method just returns the same object.

When a subclass is replacing objects it must insure that the substituted object is compatible with every field where the reference will be stored. Objects whose type is not a subclass of the type of the field or array element abort the serialization by raising an exception and the object is not be stored.

This method is called only once when each object is first encountered. All subsequent references to the object will be redirected to the new object.

Parameters:

obj - object to be substituted

Returns:

the substituted object

Throws:

IOException - Any of the usual Input/Output exceptions.

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enableResolveObject

protected boolean enableResolveObject(boolean enable)
 throws SecurityException

Enable the stream to allow objects read from the stream to be replaced. When enabled, the resolveObject method is called for every object being deserialized.

If enable is true, and there is a security manager installed, this method first calls the security manager's checkPermission method with the SerializablePermission("enableSubstitution") permission to ensure it's ok to enable the stream to allow objects read from the stream to be replaced.

Parameters:

enable - true for enabling use of resolveObject for every object being deserialized

Returns:

the previous setting before this method was invoked

Throws:

SecurityException - if a security manager exists and its checkPermission method denies enabling the stream to allow objects read from the stream to be replaced.

See Also:

SecurityManager.checkPermission(java.security.Permission), java.io.SerializablePermission

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readStreamHeader

protected void readStreamHeader()
 throws IOException,
 StreamCorruptedException

The readStreamHeader method is provided to allow subclasses to read and verify their own stream headers. It reads and verifies the magic number and version number.

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

StreamCorruptedException - if control information in the stream is inconsistent

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readClassDescriptor

protected ObjectStreamClass readClassDescriptor()
 throws IOException,
 ClassNotFoundException

Read a class descriptor from the serialization stream. This method is called when the ObjectInputStream expects a class descriptor as the next item in the serialization stream. Subclasses of ObjectInputStream may override this method to read in class descriptors that have been written in non-standard formats (by subclasses of ObjectOutputStream which have overridden the writeClassDescriptor method). By default, this method reads class descriptors according to the format defined in the Object Serialization specification.

Returns:

the class descriptor read

Throws:

IOException - If an I/O error has occurred.

ClassNotFoundException - If the Class of a serialized object used in the class descriptor representation cannot be found

Since:

1.3

See Also:

java.io.ObjectOutputStream#writeClassDescriptor(java.io.ObjectStreamClass)

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read

public int read()
 throws IOException

Enabled: Reads a byte of data. This method will block if no input is available.

Specified by:

read in interface ObjectInput

Specified by:

read in class InputStream

Returns:

the byte read, or -1 if the end of the stream is reached.

Throws:

IOException - If an I/O error has occurred.

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read

public int read(byte[] buf,
 int off,
 int len)
 throws IOException

Enabled: Reads into an array of bytes. This method will block until some input is available. Consider using java.io.DataInputStream.readFully to read exactly 'length' bytes.

Specified by:

read in interface ObjectInput

Overrides:

read in class InputStream

Parameters:

buf - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the actual number of bytes read, -1 is returned when the end of the stream is reached.

Throws:

IOException - If an I/O error has occurred.

See Also:

java.io.DataInputStream#readFully(byte[],int,int)

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available

public int available()
 throws IOException

Enabled: Returns the number of bytes that can be read without blocking.

Specified by:

available in interface ObjectInput

Overrides:

available in class InputStream

Returns:

the number of available bytes.

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

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close

public void close()
 throws IOException

Enabled: Closes the input stream. Must be called to release any resources associated with the stream.

Specified by:

close in interface ObjectInput

Overrides:

close in class InputStream

Throws:

IOException - If an I/O error has occurred.

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readBoolean

public boolean readBoolean()
 throws IOException

Enabled: Reads in a boolean.

Specified by:

readBoolean in interface DataInput

Returns:

the boolean read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readByte

public byte readByte()
 throws IOException

Enabled: Reads an 8 bit byte.

Specified by:

readByte in interface DataInput

Returns:

the 8 bit byte read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readUnsignedByte

public int readUnsignedByte()
 throws IOException

Enabled: Reads an unsigned 8 bit byte.

Specified by:

readUnsignedByte in interface DataInput

Returns:

the 8 bit byte read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readChar

public char readChar()
 throws IOException

Enabled: Reads a 16 bit char.

Specified by:

readChar in interface DataInput

Returns:

the 16 bit char read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readShort

public short readShort()
 throws IOException

Enabled: Reads a 16 bit short.

Specified by:

readShort in interface DataInput

Returns:

the 16 bit short read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readUnsignedShort

public int readUnsignedShort()
 throws IOException

Enabled: Reads an unsigned 16 bit short.

Specified by:

readUnsignedShort in interface DataInput

Returns:

the 16 bit short read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readInt

public int readInt()
 throws IOException

Enabled: Reads a 32 bit int.

Specified by:

readInt in interface DataInput

Returns:

the 32 bit integer read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readLong

public long readLong()
 throws IOException

Enabled: Reads a 64 bit long.

Specified by:

readLong in interface DataInput

Returns:

the read 64 bit long.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readFloat

public float readFloat()
 throws IOException

Enabled: Reads a 32 bit float.

Specified by:

readFloat in interface DataInput

Returns:

the 32 bit float read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readDouble

public double readDouble()
 throws IOException

Enabled: Reads a 64 bit double.

Specified by:

readDouble in interface DataInput

Returns:

the 64 bit double read.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readFully

public void readFully(byte[] buf)
 throws IOException

Enabled: Reads bytes, blocking until all bytes are read.

Specified by:

readFully in interface DataInput

Parameters:

buf - the buffer into which the data is read

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readFully

public void readFully(byte[] buf,
 int off,
 int len)
 throws IOException

Enabled: Reads bytes, blocking until all bytes are read.

Specified by:

readFully in interface DataInput

Parameters:

buf - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes to read

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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skipBytes

public int skipBytes(int len)
 throws IOException

Enabled: Skips bytes, block until all bytes are skipped.

Specified by:

skipBytes in interface DataInput

Parameters:

len - the number of bytes to be skipped

Returns:

the actual number of bytes skipped.

Throws:

EOFException - If end of file is reached.

IOException - If other I/O error has occurred.

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readLine

public String readLine()
 throws IOException

Deprecated. This method does not properly convert bytes to characters. see DataInputStream for the details and alternatives.

Enabled: Reads in a line that has been terminated by a \n, \r, \r\n or EOF.

Specified by:

readLine in interface DataInput

Returns:

a String copy of the line.

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

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readUTF

public String readUTF()
 throws IOException

Enabled: Reads a UTF format String.

Specified by:

readUTF in interface DataInput

Returns:

the String.

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

UTFDataFormatException - if read bytes do not represent a valid UTF-8 encoding of a string

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verifySubclass

private void verifySubclass()

Verifies that this (possibly subclass) instance can be constructed without violating security constraints: the subclass must not override security-sensitive non-final methods, or else the "enableSubclassImplementation" SerializablePermission is checked.

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auditSubclass

private static boolean auditSubclass(Class subcl)

Performs reflective checks on given subclass to verify that it doesn't override security-sensitive non-final methods. Returns true if subclass is "safe", false otherwise.

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clear

private void clear()

Clears internal data structures.

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readObject0

private Object readObject0(boolean unshared)
 throws IOException

Underlying readObject implementation.

IOException

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checkResolve

private Object checkResolve(Object obj)
 throws IOException

If resolveObject has been enabled and given object does not have an exception associated with it, calls resolveObject to determine replacement for object, and updates handle table accordingly. Returns replacement object, or echoes provided object if no replacement occurred. Expects that passHandle is set to given object's handle prior to calling this method.

IOException

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readTypeString

String readTypeString()
 throws IOException

Reads string without allowing it to be replaced in stream. Called from within ObjectStreamClass.read().

IOException

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readNull

private Object readNull()
 throws IOException

Reads in null code, sets passHandle to NULL_HANDLE and returns null.

IOException

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readHandle

private Object readHandle(boolean unshared)
 throws IOException

Reads in object handle, sets passHandle to the read handle, and returns object associated with the handle.

IOException

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readClass

private Class readClass(boolean unshared)
 throws IOException

Reads in and returns class object. Sets passHandle to class object's assigned handle. Returns null if class is unresolvable (in which case a ClassNotFoundException will be associated with the class' handle in the handle table).

IOException

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readClassDesc

private ObjectStreamClass readClassDesc(boolean unshared)
 throws IOException

Reads in and returns (possibly null) class descriptor. Sets passHandle to class descriptor's assigned handle. If class descriptor cannot be resolved to a class in the local VM, a ClassNotFoundException is associated with the class descriptor's handle.

IOException

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readProxyDesc

private ObjectStreamClass readProxyDesc(boolean unshared)
 throws IOException

Reads in and returns class descriptor for a dynamic proxy class. Sets passHandle to proxy class descriptor's assigned handle. If proxy class descriptor cannot be resolved to a class in the local VM, a ClassNotFoundException is associated with the descriptor's handle.

IOException

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readNonProxyDesc

private ObjectStreamClass readNonProxyDesc(boolean unshared)
 throws IOException

Reads in and returns class descriptor for a class that is not a dynamic proxy class. Sets passHandle to class descriptor's assigned handle. If class descriptor cannot be resolved to a class in the local VM, a ClassNotFoundException is associated with the descriptor's handle.

IOException

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readString

private String readString(boolean unshared)
 throws IOException

Reads in and returns new string. Sets passHandle to new string's assigned handle.

IOException

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readArray

private Object readArray(boolean unshared)
 throws IOException

Reads in and returns array object, or null if array class is unresolvable. Sets passHandle to array's assigned handle.

IOException

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readOrdinaryObject

private Object readOrdinaryObject(boolean unshared)
 throws IOException

Reads and returns "ordinary" (i.e., not a String, Class, ObjectStreamClass or array) object, or null if object's class is unresolvable (in which case a ClassNotFoundException will be associated with object's handle). Sets passHandle to object's assigned handle.

IOException

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readExternalData

private void readExternalData(Externalizable obj,
 ObjectStreamClass desc)
 throws IOException

If obj is non-null, reads externalizable data by invoking readExternal() method of obj; otherwise, attempts to skip over externalizable data. Expects that passHandle is set to obj's handle before this method is called.

IOException

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readSerialData

private void readSerialData(Object obj,
 ObjectStreamClass desc)
 throws IOException

Reads (or attempts to skip, if obj is null or is tagged with a ClassNotFoundException) instance data for each serializable class of object in stream, from superclass to subclass. Expects that passHandle is set to obj's handle before this method is called.

IOException

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skipCustomData

private void skipCustomData()
 throws IOException

Skips over all block data and objects until TC_ENDBLOCKDATA is encountered.

IOException

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defaultReadFields

private void defaultReadFields(Object obj,
 ObjectStreamClass desc)
 throws IOException

Reads in values of serializable fields declared by given class descriptor. If obj is non-null, sets field values in obj. Expects that passHandle is set to obj's handle before this method is called.

IOException

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readFatalException

private IOException readFatalException()
 throws IOException

Reads in and returns IOException that caused serialization to abort. All stream state is discarded prior to reading in fatal exception. Sets passHandle to fatal exception's handle.

IOException

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handleReset

private void handleReset()
 throws StreamCorruptedException

If recursion depth is 0, clears internal data structures; otherwise, throws a StreamCorruptedException. This method is called when a TC_RESET typecode is encountered.

StreamCorruptedException

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bytesToFloats

private static void bytesToFloats(byte[] src,
 int srcpos,
 float[] dst,
 int dstpos,
 int nfloats)

Converts specified span of bytes into float values.

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bytesToDoubles

private static void bytesToDoubles(byte[] src,
 int srcpos,
 double[] dst,
 int dstpos,
 int ndoubles)

Converts specified span of bytes into double values.

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latestUserDefinedLoader

private static ClassLoader latestUserDefinedLoader()

Returns the first non-null class loader (not counting class loaders of generated reflection implementation classes) up the execution stack, or null if only code from the null class loader is on the stack. This method is also called via reflection by the following RMI-IIOP class: com.sun.corba.se.internal.util.JDKClassLoader This method should not be removed or its signature changed without corresponding modifications to the above class.

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