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Java Can'；无法从eclipse获取嵌入式驱动程序

java eclipse

Java Can'；无法从eclipse获取嵌入式驱动程序,java,eclipse,derby,Java,Eclipse,Derby,我正在尝试使用derby数据库运行应用程序。我安装了德比。向类路径和eclipse的构建路径添加JAR。我和你一起工作。当我运行示例应用程序时，它会成功启动和完成。但当我在程序中使用时： Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance(); 它说： java.lang.ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver 虽然它在样品上工作得

我正在尝试使用derby数据库运行应用程序。我安装了德比。向类路径和eclipse的构建路径添加JAR。我和你一起工作。当我运行示例应用程序时，它会成功启动和完成。但当我在程序中使用时：

Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
它说：

java.lang.ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver
虽然它在样品上工作得很好。我卡住了。我需要帮助。 我的类路径：

/opt/Apache/db-derby-10.10.1.1-bin/lib/derby.jar:/opt/Apache/db-derby-10.10.1.1-bin/lib/derbytools.jar
： 全堆栈跟踪

11.02.2014 11:54:20 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
11.02.2014 11:54:20 org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Java_lab1' did not find a matching property.
11.02.2014 11:54:20 org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Java_lab2' did not find a matching property.
11.02.2014 11:54:20 org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Lab4DWP' did not find a matching property.
11.02.2014 11:54:20 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
11.02.2014 11:54:20 org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
11.02.2014 11:54:20 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 559 ms
11.02.2014 11:54:20 org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
11.02.2014 11:54:20 org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.42
11.02.2014 11:54:21 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.42/webapps/docs
11.02.2014 11:54:21 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.42/webapps/examples
11.02.2014 11:54:21 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
11.02.2014 11:54:21 org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
11.02.2014 11:54:21 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@63fb050c')
11.02.2014 11:54:21 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.42/webapps/host-manager
11.02.2014 11:54:21 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.42/webapps/manager
11.02.2014 11:54:21 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.42/webapps/ROOT
11.02.2014 11:54:21 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
11.02.2014 11:54:21 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
11.02.2014 11:54:21 org.apache.catalina.startup.Catalina start
INFO: Server startup in 628 ms
java.lang.ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:171)
    at DB.DBServlet.doGet(DBServlet.java:49)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:695)
11.02.2014 11:54:32 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/Lab4DWP] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at org.apache.jsp.main_jsp._jspService(main_jsp.java:80)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:695)
在Lab4DWP的WebContent/WEB-INF/lib copy中粘贴所有Derby jar并尝试在Lab4DWP的WebContent/WEB-INF/lib copy中粘贴所有Derby jar并尝试在Lab4DWP的WebContent/WEB-INF/lib copy中粘贴所有Derby jar并尝试在Lab4DWP的WebContent/WEB-INF/lib copy中粘贴所有Derby jar并尝试添加Derby.jar吗？教程cleary说，如果你看到这个错误，应该遵循什么。你试过了吗？因为错误表明您的类路径中没有jar。这是我的类路径和构建路径，应该可以。在任何一个类中，尝试出于测试目的导入它，比如
import org.apache.derby.jdbc。
press control+space。Eclipse是否向您展示了包中的各种类？您是否在eclipse项目的Java资源库中看到了derby.jar？是的，它显示了。而且我选择了嵌入式驱动程序。错误是一样的。没有人…Lab4DWP是一个网络应用，对吗？？在WebContent/WEB-INF/lib中…在这个lib副本中，您添加了derby.jar吗？教程cleary说，如果你看到这个错误，应该遵循什么。你试过了吗？因为错误表明您的类路径中没有jar。这是我的类路径和构建路径，应该可以。在任何一个类中，尝试出于测试目的导入它，比如
import org.apache.derby.jdbc。
press control+space。Eclipse是否向您展示了包中的各种类？您是否在eclipse项目的Java资源库中看到了derby.jar？是的，它显示了。而且我选择了嵌入式驱动程序。错误是一样的。没有人…Lab4DWP是一个网络应用，对吗？？在WebContent/WEB-INF/lib中…在这个lib副本中，您添加了derby.jar吗？教程cleary说，如果你看到这个错误，应该遵循什么。你试过了吗？因为错误表明您的类路径中没有jar。这是我的类路径和构建路径，应该可以。在任何一个类中，尝试出于测试目的导入它，比如
import org.apache.derby.jdbc。
press control+space。Eclipse是否向您展示了包中的各种类？您是否在eclipse项目的Java资源库中看到了derby.jar？是的，它显示了。而且我选择了嵌入式驱动程序。错误是一样的。没有人…Lab4DWP是一个网络应用，对吗？？在WebContent/WEB-INF/lib中…在这个lib副本中，您添加了derby.jar吗？教程cleary说，如果你看到这个错误，应该遵循什么。你试过了吗？因为错误表明您的类路径中没有jar。这是我的类路径和构建路径，应该可以。在任何一个类中，尝试出于测试目的导入它，比如
import org.apache.derby.jdbc。
press control+space。Eclipse是否向您展示了包中的各种类？您是否在eclipse项目的Java资源库中看到了derby.jar？是的，它显示了。而且我选择了嵌入式驱动程序。错误是一样的。没有人…Lab4DWP是一个网络应用，对吗？？在该WebContent/WEB-INF/lib中…在此库中复制粘贴