这个是什么报错呀？什么意思，求指点。

xtavoxing

javax.servlet.ServletException: java.lang.NullPointerException
        at com.justep.ui.servlet.MainServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at com.justep.portal.filter.RedirectFilter.doFilter(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at java.io.FilterInputStream.close(FilterInputStream.java:181)
        at sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream.close(Jar
URLConnection.java:108)
        at com.justep.ui.ResourceServer.execute(Unknown Source)
        ... 17 more
2016-04-15 11:39:12 null
javax.servlet.ServletException: java.lang.NullPointerException
        at com.justep.ui.servlet.MainServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at com.justep.portal.filter.RedirectFilter.doFilter(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at java.io.FilterInputStream.close(FilterInputStream.java:181)
        at sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream.close(Jar
URLConnection.java:108)
        at com.justep.ui.ResourceServer.execute(Unknown Source)
        ... 17 more
四月 15, 2016 11:42:00 上午 org.apache.catalina.connector.CoyoteAdapter convertU
RI
严重: Invalid URI character encoding; trying ascii
四月 15, 2016 11:42:03 上午 org.apache.catalina.connector.CoyoteAdapter convertU
RI
严重: Invalid URI character encoding; trying ascii
四月 15, 2016 11:42:06 上午 org.apache.catalina.connector.CoyoteAdapter convertU
RI
严重: Invalid URI character encoding; trying ascii
四月 15, 2016 11:42:09 上午 org.apache.catalina.connector.CoyoteAdapter convertU
RI
严重: Invalid URI character encoding; trying ascii
2016-04-15 11:56:46 null
javax.servlet.ServletException: java.lang.NullPointerException
        at com.justep.ui.servlet.MainServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at com.justep.portal.filter.RedirectFilter.doFilter(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at java.io.FilterInputStream.close(FilterInputStream.java:181)
        at sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream.close(Jar
URLConnection.java:108)
        at com.justep.ui.ResourceServer.execute(Unknown Source)
        ... 17 more
2016-04-15 11:56:49 null
javax.servlet.ServletException: java.lang.NullPointerException
        at com.justep.ui.servlet.MainServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at com.justep.portal.filter.RedirectFilter.doFilter(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
        at java.io.FilterInputStream.close(FilterInputStream.java:181)
        at sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream.close(Jar
URLConnection.java:108)
        at com.justep.ui.ResourceServer.execute(Unknown Source)
        ... 17 more

liangyongfei

空指针错误
NullPointerException
应该是java代码中某个对象不存在！但是调用这个对象的方法导致的！！
具体你自己调试看看！是否设置了什么空值导致的？？

xtavoxing

liangyongfei 发表于 2016-4-15 14:49
空指针错误
NullPointerException
应该是java代码中某个对象不存在！但是调用这个对象的方法导致的！！

也是在网页版里调式吗？
按F12?

liangyongfei

xtavoxing 发表于 2016-4-15 15:30
也是在网页版里调式吗？
按F12?

java 报错 当然是在java代码中调试了！！
请问你是做什么操作报错的？？是自己写的java代码出错的吧！

似乎和文件操作有关系！

你最好说清楚些吧！具体做什么，执行什么代码时候报错的！

xtavoxing

liangyongfei 发表于 2016-4-15 16:39
java 报错 当然是在java代码中调试了！！
请问你是做什么操作报错的？？是自己写的java代码出错的吧！

请问有java 的基本的调试  说明吗？

liangyongfei

xtavoxing 发表于 2016-4-15 18:58
请问有java 的基本的调试  说明吗？

就是，在java代码的上级目录中！右键，选择 ： 设置为src路径！！
打断调试，和eclipse 中的做法一样！！这个你上网查吧！

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