Packet for query is too large (1 reply)

Hello,

I hope you can help me.

I´m trying to use the MySQL-Database of my Webspace via Java. To do that I need to connect to the Webspace using a ssh-tunnel, I use JSch to do that an the Connections works.

To connect to the database I use Connector/J 5.1.27. Here is the code I use in Java:

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Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db553?maxAllowedPacket=104857","user","pw");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM Test");
*******************************************

I get the folowing error:


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com.mysql.jdbc.PacketTooBigException: Packet for query is too large (4739923 > 1048576). You can change this value on the server by setting the max_allowed_packet' variable.
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:613)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1088)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2526)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2311)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at dbtest.main(dbtest.java:61)
**********************************************

I only have a small Webspace, so I can not Change the "max_allowed_packet'" but with "maxAllowedPacket=104857" the error should not appear, or am I wrong? What is my mistake? The Error Occurs directly after the line:

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db553?maxAllowedPacket=104857","user","pw");


So the System is only opening the Connection.

Any Ideas?

Kind Regards,
Sebix