Estado HTTP 500 –使用Java Servlet的内部服务器错误，Netbeans ide 11.1 tomcat 9.029

Question

[每当我尝试调用servlet时，它都会给我“ Estado HTTP 500 –内部服务器错误”。

即使我只是为了测试它而在新的Web应用程序中创建新的servlet，它也会出现相同的错误。奇怪的是，昨天它工作正常，我没有在项目中更改任何内容

页面：

excepción
javax.servlet.ServletException: Error instanciando clase de servlet [Servlets.Inicio]
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.base/java.lang.Thread.run(Thread.java:830)


causa raíz
java.lang.RuntimeException: 
    Servlets.Inicio.<init>(Inicio.java:1)
    java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
    java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
    org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
    org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
    org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.base/java.lang.Thread.run(Thread.java:830)

log：

27-Nov-2019 14:22:58.404 INFO [http-nio-8080-exec-309] org.apache.catalina.core.ApplicationContext.log Marcando el servlet [Inicio] como no disponible
27-Nov-2019 14:22:58.404 SEVERE [http-nio-8080-exec-309] org.apache.catalina.core.StandardWrapperValve.invoke Excepción de reserva de espacio para servlet [Inicio]
    java.lang.RuntimeException: 
        at Servlets.Inicio.<init>(Inicio.java:1)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
        at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:151)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1042)
        at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:761)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:830)

我正在使用Netbeans 11.1和Tomcat 9.029作为服务器。

我也尝试过将服务器更改为Glassfish，但出现相同的错误。

Answer 1

我有类似的错误，我的环境是：

Win 7 x64Netbeans v11.1Apache Tomcat v9.0.29Java JDK v11.0.4

我使用代码链接：https://www.youtube.com/watch?v=uDUow5nPmOU

在此示例中，我可以插入2号（index.html），但是当我激活按钮ADD（调用add.java）时，出现错误：-（

我认为有不兼容的beetwen NB 11.1和Tomvat 9.0.29

HTTP状态500 –内部服务器错误类型异常报告实例化servlet类时出现消息错误[添加]描述服务器遇到意外状况，阻止其满足请求。

例外

javax.servlet.ServletException：实例化servlet类[添加]时出错org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:526）org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:92）org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:678）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:343）org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:367）org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:65）org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:860）org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1591）org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）java.base / java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1128）java.base / java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:628）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）java.base / java.lang.Thread.run（Thread.java:834）

根本原因

java.lang.RuntimeException：加（add.java:1）java.base / jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）java.base / jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）java.base / jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）java.base / java.lang.reflect.Constructor.newInstance（Constructor.java:490）org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:526）org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:92）org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:678）org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:343）org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:367）org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:65）org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:860）org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1591）org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）java.base / java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1128）java.base / java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:628）org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）java.base / java.lang.Thread.run（Thread.java:834）

LOG：28-Nov-2019 19：01：43.449信息[主] org.apache.catalina.core.ApplicationContext.log ContextListener：attributeAdded（'StockTicker'，'async.Stockticker@15deb1dc'）28-Nov-2019 19：08：31.144信息[http-nio-8080-exec-4] org.apache.catalina.core.ApplicationContext.log将servlet [add]标记为不可用28-Nov-2019 19：08：31.145严重[http-nio-8080-exec-4] org.apache.catalina.core.StandardWrapperValve.invoke为Servlet分配异常[添加]java.lang.RuntimeException：在添加时。（add.java:1）在java.base / jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0（本地方法）在java.base / jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）在java.base / jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）在java.base / java.lang.reflect.Constructor.newInstance（Constructor.java:490）在org.apache.catalina.core.DefaultInstanceManager.newInstance（DefaultInstanceManager.java:151）在org.apache.catalina.core.StandardWrapper.loadServlet（StandardWrapper.java:1042）在org.apache.catalina.core.StandardWrapper.allocate（StandardWrapper.java:761）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:135）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:526）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:139）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:92）在org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:678）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:74）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:343）在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:367）在org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:65）在org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:860）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1591）在org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）在java.base / java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1128）在java.base / java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:628）在org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.base / java.lang.Thread.run（Thread.java:834）