Tomcat6 kann keine Verbindung zu MySql (Der Fahrer hat nicht alle empfangenen Pakete vom server)

mir läuft ein Apache-Tomcat-6.0.20 /MySQL 5.1.37-lubuntu /sun-java6-jdk /sun-java6-jre /sun-java6-bin auf meinem lokalen Rechner mit Ubuntu 9.10 als OS.
Ich versuche, eine einfache DB-Abfrage, Beispiel für die Ausführung für 2 Tage jetzt, aber ich bekomme immer noch diese Ausnahme:

org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)"
 org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)"
 org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
 org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
 org.apache.jsp.index_jsp._jspService(index_jsp.java:104)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.)"
 org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.getConnection(QueryTagSupport.java:285)
 org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doStartTag(QueryTagSupport.java:168)
 org.apache.jsp.index_jsp._jspx_meth_sql_005fquery_005f0(index_jsp.java:274)
 org.apache.jsp.index_jsp._jspx_meth_c_005fotherwise_005f0(index_jsp.java:216)
 org.apache.jsp.index_jsp._jspx_meth_c_005fchoose_005f0(index_jsp.java:130)
 org.apache.jsp.index_jsp._jspService(index_jsp.java:93)
 org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

meine web.xml sieht wie folgt aus :

<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    version="2.5">
  <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/testDB</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>
</web-app>

den context.xml sieht wie folgt aus :

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/my1stApp" docBase="/var/www/jsp/my1stApp" debug="5" reloadable="true" crossContext="true">
    <Resource name="jdbc/testDB" auth="Container" type="javax.sql.DataSource"
    maxActive="5" maxIdle="5" maxWait="10000"
    username="user" password="password" driverClassName="com.mysql.jdbc.Driver"
    url="jdbc:mysql://localhost:3306/some"/>
</Context>

und der jsp-Datei sieht wie folgt aus:

<%@ page contentType="text/html" %>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>


<html>

  <head>

    <title>DroneLootTool</title>

  </head>

  <body bgcolor="white">



 <sql:query var="res" dataSource="jdbc/testDB">
  select name, othername 
  from mytable
 </sql:query>

  <h2>Results</h2>

<c:forEach var="row" items="${res.rows}">
    Name ${row.name}<br/>
    MoreName ${row.othername}<br/><br/>
</c:forEach>


  </body>

</html>

• gelesen, viele Foren-Einträge /versucht viele verschiedene Einstellungen (immer wieder geändert, um die ursprünglichen Einstellungen, wenn es nicht' arbeiten)
• set TOMCAT6_SECURITY=no in der /etc/default/tomcat6, weil TOMCAT6_SECURITY=ja, war ärger zu
• die skip-networking flag nicht gesetzt ist, die DB (BIND 127.0.0.1 gesetzt ist)
• firewall ist swiched aus (sudo ufw disable)
• MySQL funktioniert (mehrfach getestet mit dem Benutzer verwendet, in diesem skript)
• telnet localhost 3306 sagt

  Trying ::1...
  Trying 127.0.0.1...
  Verbunden mit localhost.
  Escape character is '^]'.
  Connection closed by foreign host.

---

Den TestConnection.java produziert die folgende Ausgabe:

mich@mein-laptop:~/Desktop$ java -classpath '/usr/share/java/mysql.jar werden:./' TestConnection com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/testDB myuser mypassword

com.mysql.jdbc.CommunicationsException: Communications link failure
    Last packet sent to the server was 0 ms ago.
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2103)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:185)
        at TestConnection.checkConnection(TestConnection.java:40)
        at TestConnection.main(TestConnection.java:21)
    Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure

    Last packet sent to the server was 0 ms ago.
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070)
        at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:666)
        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1069)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2031)
        ... 7 more
    Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2431)
        at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:590)
        ... 9 more
    Connection failed.

---

ich weiß nicht, ob es einen Unterschied gibt zwischen der Art der java-Treiber verbindet die DB und die Perl-DBI-Modul nicht, aber dieses PERL-skript funktioniert

#!/usr/bin/perl -w 

use CGI;
use DBI;
use strict;

print CGI::header();

my $dbh = DBI->connect("dbi:mysql:some:localhost", "user", "password");

my $sSql = "SELECT * from mytable";

my $ppl = $dbh->selectall_arrayref( $sSql );

foreach my $pl (@$ppl)
{
  my @array = @$pl;
  print @array;
}

$dbh->disconnect;

---

aktiviert --log-warnings auf die mysql, aber ich bekam keine neuen Warnungen.
Wenn ich war auf der Suche die Protokolle für die Warnungen fand ich diese Meldung, wenn ich starten Sie den tomcat, weiß nicht, ob es hilft, das problem zu finden :

Feb  2 19:50:37 tobias-laptop jsvc.exec[3129]: 02.02.2010 19:50:37 org.apache.catalina.startup.HostConfig checkResources#012INFO: Undeploying context [/myapp]
Feb  2 19:50:37 tobias-laptop jsvc.exec[3129]: 02.02.2010 19:50:37 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads#012SCHWERWIEGEND: A web application appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed to stop it. This is very likely to create a memory leak.
Feb  2 19:50:37 tobias-laptop jsvc.exec[3129]: 02.02.2010 19:50:37 org.apache.catalina.startup.HostConfig deployDescriptor#012INFO: Deploying configuration descriptor myapp.xml

InformationsquelleAutor Tobias Wiesenthal | 2010-01-31