的Tomcat6無法連接到MySQL（駕駛員尚未收到來自服務器的任何數據包）

我運行一個的Apache Tomcat 6.0.20/MySQL的5.1.37-lubuntu /太陽的Java6 - JDK /太陽java6- JRE /我的本地機器上使用Ubuntu 9.10操作系統作爲太陽的Java6斌。我試圖讓現在運行的2天一個簡單的數據庫查詢的例子，但我仍然得到此異常：的Tomcat6無法連接到MySQL（駕駛員尚未收到來自服務器的任何數據包）

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)

我的web.xml看起來是這樣的：

<?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>

上下文.XML是這樣的：

<?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>

和JSP文件看起來像這樣：

<%@ 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>

讀很多論壇條目/試過很多不同的設置（總是改回原來的設置時，它沒有」工作）
集TOMCAT6_SECURITY =沒有在/ etc /默認/ tomcat6中，因爲TOMCAT6_SECURITY = YES是造成麻煩太
跳過聯網標誌沒有被設置爲DB（BIND 127.0.0.1設置）
防火牆swiched關閉（須藤UFW禁用）
MySQL的工作（與用戶在這個使用了幾次測試skript）
telnet localhost 3306表示

Trying :: 1 ... 嘗試127.0.0.1 ... 連接到本地主機。轉義字符是'^]'。由外國主機關閉的連接。

的TestConnection.java產生了以下的輸出：

我@我的，筆記本電腦：〜/桌面$的java -classpath「/usr/share/java/mysql.jar:./ 「TestConnection com.mysql.jdbc.Driver的jdbc：mysql的：//本地主機：3306/TESTDB myuser的輸入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.

我不知道是否存在JAV方式之間的差異驅動程序連接到數據庫和Perl DBI模塊的做法，但這種PERL skript工程上的MySQL

#!/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;

啓用--log的警告，但我沒有得到任何新的警告。當我搜索日誌中的警告，我發現這個消息時，我重新啓動Tomcat，不知道這是否有助於發現問題：

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

來源

2010-01-31 Tobias Wiesenthal

你能不能從http嘗試'TestConnection.java'：//testdrive.mapinfo。 com/techsupp/miprod.nsf/kbase_by_product/B309A6631406A514852569770060E795並更新結果的問題？ – 2010-01-31 17:46:15

你在哪裏放置了mysql驅動程序jar？嘗試刪除auth =「Container」屬性以及 – nos 2010-01-31 18:45:49

從/ usr/share/java中鏈接到tomcat6/lib中的mysql.jar。/usr/share/java中的 mysql.jar是同一目錄中實際文件的符號鏈接。試過版本mysql-connector-java-5.1.11和5.1.6。刪除auth =「Container」屬性也沒有幫助。 :( – 2010-02-01 12:03:24

請與「官方」 Connector/J 5.1即由MySQL分發嘗試，而不是一個deb（請注意，我並不反對DEB什麼）。

也請啓用MySQL服務器上--log-warnings並查看是否有被顯示在你的錯誤日誌了。

來源

2010-02-02 12:24:29

我使用官方連接器版本5.1.11，啓用 - 日誌-warnings。更新了問題 – 2010-02-03 07:30:24

我解決了這個問題。這個錯誤發生的原因是tomcat的安全限制。

您有以下行添加到您的$TOMCAT-CONFIG/policy.d/04webapps.policy

permission java.net.SocketPermission "127.0.0.1:3306", "connect";

爲我工作，希望它會爲你工作太:)

來源

2010-05-13 20:51:01

任何人都可以批准這是一個很好的解決方案嗎？ – 2012-06-20 11:16:42

我有同樣的問題。這對我不起作用。 – jasonmclose 2012-09-02 19:10:18

Class.forName("com.mysql.jdbc.Driver"); 
      con=DriverManager.getConnection("jdbc:mysql://localhost:3306/indiadb","root","root");

檢查：

的端口號必須只有3306
在lib中添加mysql.jar如果您使用的Tomcat6

來源

2012-03-29 07:00:48

我有同樣的問題。

原來我通過以下三個mysqld的情況下搞砸了服務器，所以殺不必要的解決我的問題：

[email protected]:~$ ps aux | grep mysql 
mysql  8149 0.1 0.4 280484 26008 ?  Ssl 13:24 0:00 /usr/sbin/mysqld 
me  8256 0.0 0.0 4392 836 pts/3 S+ 13:24 0:00 grep --color=auto mysql 
root  26569 0.0 0.0 5952 1856 ?  S 10:44 0:00 sudo /usr/sbin/mysqld --skip-grant-tables --skip-networking 
mysql 26570 0.1 0.6 323528 41936 ?  Sl 10:44 0:15 /usr/sbin/mysqld --skip-grant-tables --skip-networking 

[email protected]:~$ sudo kill 26570

來源

2013-01-17 05:34:35 Louis

的Tomcat6無法連接到MySQL（駕駛員尚未收到來自服務器的任何數據包）

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