classnotfoundexception

This question already has an answer here: ClassNotFoundException com.mysql.jdbc.Driver [duplicate] 21 answers Connect Java to a MySQL database 13 answers This question has been asked a lot here, but i still can't fix my problem: I put mysql-connector-java-5.1.18-bin into C:\Program Files\Java\jre6\lib\ext folder. I have this code: // Load the database driver Class.forName("com.mysql.jdbc.Driver"); // Get a connection to the database Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/mysql", "root", "4958ps"); // Get a statement from the connection Statement stmt = conn

I am a newbie in java and I'm developing a Java EE application on the Netbeans 6.9.1 IDE. I have to connect my java application with SQL Server 2005. For that I have downloaded the sqljdbc.jar file and have put it into C:\Program Files (x86)\Microsoft SQL Server\JDBC Drver\lib on my system and have set its classpath on command prompt like this set classpath=.;C:\Program Files (x86)\Microsoft SQL Server\JDBC Drver\lib\sqljdbc.jar and have set the classpath in the IDE by right clicking on the main project and selecting its property selecting libraries. Then in compile tab added a sqljdbc.jar ,

很多人都使用tomcat来作为java web项目的服务器，特别是在开发阶段，选择的人更多。本文所说的问题针对tomcat的开发环境，在正式环境中不会出现这个问题。 前段时间，在进行项目运行的时候出现了一件怪事：一个类明明就有，但是tomcat在启动的时候就是要反复报“java.lang.ClassNotFoundException”，经过不断检查，上网查询，终于找到了原因并解决之，下面做一些说明，希望对其他人有所帮助。 0、重现 要重现这个问题，需要满足一些条件：在开发的IDE中进行部署（如eclipse，这是很常见的），项目中有用户登录的操作，连续的直接重启服务器（这在开发中也是很常见的）。 这个问题并不是每次都会出现，只不过出现的概率也是挺大的，出现的时候报的错误就是说的用于在session中保存用户登录的那个类找不到，服务器也启动成功，但是看到有异常总感觉不舒坦，就想解决了她。 1、原因 出现这个问题的原因就是tomcat在关闭的时候会保存当前存在的session对象，然后在启动的时候恢复，这个的具体过程没有去研究过，不过关于这个的例子大家可以试一试——就是在正式环境（不是在IDE中部署）中，用户登录之后不关闭浏览器，使用tomcat的shutdown脚本关闭服务器，然后在启动服务器，就可以看到浏览器的session还是有效的。 这个功能默认都是开启的

I'm develop android application and than i wanna additional new Activity i had error on my logcat My LogCat: 04-19 12:59:17.654: D/AndroidRuntime(18135): Shutting down VM 04-19 12:59:17.654: W/dalvikvm(18135): threadid=1: thread exiting with uncaught exception (group=0x4001d878) 04-19 12:59:17.684: E/AndroidRuntime(18135): FATAL EXCEPTION: main 04-19 12:59:17.684: E/AndroidRuntime(18135): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.bvblogic.android.batterypower/com.bvblogic.android.batterypower.activities.UnlockActivity}: java.lang.ClassNotFoundException: com

This question already has an answer here: Deploying a JSF webapp results in java.lang.ClassNotFoundException: javax.servlet.jsp.jstl.core.Config [duplicate] 3 answers When I am run my application after entering the URL, this exception is coming.I am using Eclipse and Tomcat7.0.35. I also added Jstl.jar and jstl1.2.jar My code is java.lang.ClassNotFoundException: javax.servlet.jsp.jstl.core.Config at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) at org.apache.myfaces.view

I'm trying to make a REST web service. My project looks like : The traceback is : 8 déc. 2011 18:31:36 org.apache.catalina.core.AprLifecycleListener init INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\MyEclipse\Common\binary\com.sun.java.jdk.win32.x86_1.6.0.013\bin;C:\Program Files\MyEclipse\Common\plugins\com.genuitec.eclipse.easie.tomcat.myeclipse_9.0.0.me201109141806\tomcat\bin 8 déc. 2011 18:31:36 org.apache.coyote.http11.Http11Protocol init INFO: Initialisation de Coyote HTTP/1.1