List:MySQL and Java« Previous MessageNext Message »
From:Christian Mack Date:July 27 1999 7:32pm
Subject:Re: segmentation violation???
View as plain text  
James Doucette wrote:
> 
> I'm running a java application that accesses a mysql database and
> produced reports in html formats.. anyways, the program compiles and runs
> one one machine (Irix), but when I try it on a different machine (Linux)
> it will compile, but won't run... instead it produces the following errors:
> 
> SIGSEGV 11* segmentation violation
>         stackbase=0xbffffa78, stackpointer=0xbffff978 Full thread dump:
>     "Finalizer thread" (TID:0x4076d210, sys_thread_t:0x414b1e0c, state:R)
> prio=1
>     "Async Garbage Collector" (TID:0x4076d258, sys_thread_t:0x41490e0c,
> state:R) prio=1
>     "Idle thread" (TID:0x4076d2a0, sys_thread_t:0x4146fe0c, state:R)
> prio=0
>     "Clock" (TID:0x4076d088, sys_thread_t:0x4144ee0c, state:CW) prio=12
>     "main" (TID:0x4076d0b0, sys_thread_t:0x8188d78, state:R) prio=5
> *current thread*
>         java.net.PlainSocketImpl.<clinit>(PlainSocketImpl.java:60)
>         java.net.Socket.<init>(Socket.java:52)
>         java.net.Socket.<init>(Socket.java:198)
>         java.net.Socket.<init>(Socket.java:89)
>         org.gjt.mm.mysql.MysqlIO.<init>(MysqlIO.java:87)
>         org.gjt.mm.mysql.Connection.<init>(Connection.java:228)
>         org.gjt.mm.mysql.Driver.connect(Driver.java:126)
>         java.sql.DriverManager.getConnection(DriverManager.java:83)
>         java.sql.DriverManager.getConnection(DriverManager.java:126)
>         worktable.start(worktable.java:63)
>         worktable.main(worktable.java:36) Monitor Cache Dump:
>     java.lang.Class@1081544640/1081943312: owner "main" (0x8188d78, 2
> entries)
>     org.gjt.mm.mysql.Driver@1081544648/1081943304: owner "main"
> (0x8188d78, 1 entry) Registered Monitor Dump:
>     Thread queue lock: <unowned>
>     Name and type hash table lock: <unowned>
>     String intern lock: <unowned>
>     JNI pinning lock: <unowned>
>     JNI global reference lock: <unowned>
>     BinClass lock: <unowned>
>     Class loading lock: <unowned>
>     Java stack lock: <unowned>
>     Code rewrite lock: <unowned>
>     Heap lock: <unowned>
>     Has finalization queue lock: <unowned>
>     Finalize me queue lock: <unowned>
>     Dynamic loading lock: <unowned>
>     Monitor IO lock: <unowned>
>     Child death monitor: <unowned>
>     Event monitor: <unowned>
>     I/O monitor: <unowned>
>     Alarm monitor: <unowned>
>         Waiting to be notified:
>             "Clock" (0x4144ee0c)
>     Monitor registry: owner "main" (0x8188d78, 1 entry) Thread Alarm Q:
> Aborted (core dumped)
> 
> Here is the code.....
> 
> import org.gjt.mm.mysql.*;
> import org.gjt.mm.mysql.Connection;
> import org.gjt.mm.mysql.Statement;
> import org.gjt.mm.mysql.Driver;
> import org.gjt.mm.mysql.ResultSet;
> import org.gjt.mm.mysql.ResultSetMetaData;
> import java.io.*;
> import java.sql.*;
> import java.util.*;
> import java.awt.*;
> import java.awt.event.*;
> import java.applet.Applet;
> 
> class worktable {
>         static Connection con;
>         static ResultSet rs;
> 
> //********************************************************************
> // main method
> //********************************************************************
>         public static void main(String argv[]) {
>                 start();
>         }
> 
> //*******************************************************************
> //******************************************************************
>         static void start() {
> 
>                 String url = "urlstuff";
> 
>                 try {
>                         PrintStream ostream = new PrintStream(new
> FileOutputStream("worktable.html"));
> 
>                         try {
>                                 Class.forName("org.gjt.mm.mysql.Driver");
>                         }
>                         catch (Exception ex) {
>                                 System.out.println("Can't find database driver class:
> " + ex);
>                         }
> 
>                         try {
>                                 con = (Connection)DriverManager.getConnection(url,
> "james", null);
>                         }
>                         catch (SQLException ex) {
>                                 System.out.println("SQL Exception: " + ex);
>                         }
> 
> ............................ etc.
> 
> The error seems to be occuring at con = (Connection)DriverManager.getConnection(url,
> "james", null);
> 
> Any suggestions.....

Hi James

_Never_ import the driver classes.

You didn't say what VM and OS version you are using.
The above seems to be a buggy VM (or threading problems).

BTW:
Why are you compiling it on Linux again?
Can't you just move the class files to the Linux box?

Tschau
Christian

Thread
segmentation violation???James Doucette27 Jul
  • Re: segmentation violation???Christian Mack27 Jul
Re: segmentation violation??? williamrussell27 Jul