Compiling with mysql

Wed Sep 3 15:19:00 GMT 2008

ezer wrote:
> Andrew, i dont understand what do you mean with exactly, I will try to
> explain again, i isolated the problem only compiling a short code that only
> conects to the database and exit. 
>> 1) The code is the following
>> import java.sql.*;
>> public class MysqlConnect{
> public static void main(String[] args) {
> System.out.println("MySQL Connect Example.");
> Connection conn = null;
> String url = "jdbc:mysql://localhost:3306/";
> String dbName = "myDatabase";
> String driver = "com.mysql.jdbc.Driver";
> String userName = "root";
> String password = "root";
> try {
> Class.forName(driver).newInstance();
> conn = DriverManager.getConnection(url+dbName,userName,password);
> System.out.println("Connected to the database");
> conn.close();
> System.out.println("Disconnected from database");
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> }

As far as I can tell the error message is not coming from gcj,
but from mysql. It's quite possible that this is caused by
a bug in gcj, but I'd have to debug it to know for sure. Is
there a log from mysql?
Andrew.
> 2) I compile
> gcj --main=MysqlConnect -o mysqlconnect MysqlConnect.java
>> (gcj version : 4.3.1)
>> 3) Execution:
>> ./mysqlconnect
>> 4) Output:
>> MySQL Connect Example.
> com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in
> your SQL syntax; check the manual that corresponds to your MySQL server
> version for the right syntax to use near '????????????????????????????????'
> at line 1
> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
> at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
> at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
> at
> com.mysql.jdbc.Connection.configureClientCharacterSet(Connection.java:2525)
> at
> com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:4139)
> at com.mysql.jdbc.Connection.createNewIO(Connection.java:2789)
> at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
> at
> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
> at java.sql.DriverManager.getConnection(libgcj.so.90)
> at java.sql.DriverManager.getConnection(libgcj.so.90)
> at MysqlConnect.main(MysqlConnect.java:14)
>> 5) I installed a previous version of gcj 4.2 and repetead the compilation
> and execution, and the result was the following:
>> MySQL Connect Example.
> java.sql.SQLException: Error during query: Unexpected Exception:
> java.io.CharConversionException message given: null
>> Nested Stack Trace:
>>> ** BEGIN NESTED EXCEPTION ** 
>> java.io.CharConversionException
>> STACKTRACE:
>> java.io.CharConversionException
> at gnu.gcj.convert.Input_iconv.read(libgcj.so.81)
> at java.lang.String.init(libgcj.so.81)
> at java.lang.String.<init>(libgcj.so.81)
> at
> com.mysql.jdbc.SingleByteCharsetConverter.<init>(SingleByteCharsetConverter.java:153)
> at
> com.mysql.jdbc.SingleByteCharsetConverter.initCharset(SingleByteCharsetConverter.java:108)
> at
> com.mysql.jdbc.SingleByteCharsetConverter.getInstance(SingleByteCharsetConverter.java:86)
> at com.mysql.jdbc.Connection.getCharsetConverter(Connection.java:3505)
> at com.mysql.jdbc.StringUtils.getBytes(StringUtils.java:615)
> at com.mysql.jdbc.Buffer.writeStringNoNull(Buffer.java:655)
> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1686)
> at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
> at
> com.mysql.jdbc.Connection.configureClientCharacterSet(Connection.java:2525)
> at
> com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:4139)
> at com.mysql.jdbc.Connection.createNewIO(Connection.java:2789)
> at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
> at
> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
> at java.sql.DriverManager.getConnection(libgcj.so.81)
> at java.sql.DriverManager.getConnection(libgcj.so.81)
> at MysqlConnect.main(mysqlconnect)
>>> ** END NESTED EXCEPTION **
>>> at com.mysql.jdbc.Connection.execSQL(Connection.java:3330)
> at
> com.mysql.jdbc.Connection.configureClientCharacterSet(Connection.java:2525)
> at
> com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:4139)
> at com.mysql.jdbc.Connection.createNewIO(Connection.java:2789)
> at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
> at
> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
> at java.sql.DriverManager.getConnection(libgcj.so.81)
> at java.sql.DriverManager.getConnection(libgcj.so.81)
> at MysqlConnect.main(mysqlconnect)
>> 6) It seems it cant execute the line conn =
> DriverManager.getConnection(url+dbName,userName,password);
> From the same machine executing with java sun, it did well, but not with the
> java version from the gcj.. 
>> It was exactly what i did.. dont know what else could i add.
>>>>>>>> Andrew Haley wrote:
>> ezer wrote:
>>> New try:
>>>>>> I generated mysql-connector-java-5.0.8-bin.o
>>> and used it in the compilation of the program
>>> gcj --main=Search --classpath=mysql-connector-java-5.0.8-bin.o 
>>> Searcher.jar
>>> -o search
>>>>>> It compiles without errors, but when i execute ./search i get
>>> segmentation
>>> fault
>>>>>> I dont know what to do.. help please...
>> the key problem here is that you haven't told us *exactly* what you are
>> doing. We need to know if we can help you.
>>>> http://www.catb.org/~esr/faqs/smart-questions.html
>>>> Andrew.
>>>>>>>>>