HTTP Status 500 -
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type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NumberFormatException: null
org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:77)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(Thread.java:619)
root cause
java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Integer.java:415)
java.lang.Integer.parseInt(Integer.java:497)
org.directwebremoting.util.VersionUtil.loadProperties(VersionUtil.java:119)
org.directwebremoting.util.VersionUtil.getLabel(VersionUtil.java:99)
org.directwebremoting.impl.StartupUtil.logStartup(StartupUtil.java:157)
org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:62)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(Thread.java:619)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.24 logs.
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Apache Tomcat/6.0.24
------最佳解决方案--------------------------------------------------------
发NumberFormatException异常：主要原因是将用户提交的内容转换为整数或者浮点数时用户输入了其它非法字符。处理的主要方式是在需要进行转换的地方使用try/catch块捕获此异常然后提示用户输入合法数据。
最好把代码贴出来
------其他解决方案--------------------------------------------------------
既然用了ssh+dwr，就可以集成开发，全用注解注入，删除dwr.xml
package com.unite.web.dwr;
import org.directwebremoting.annotations.RemoteMethod;
import org.directwebremoting.annotations.RemoteProxy;
import org.springframework.beans.factory.annotation.Autowired;
import com.unite.dao.UserDao;
@RemoteProxy(name="user")
public class UserDwr {
@Autowired
private UserDao userDao;
@RemoteMethod
public String getUserName(Long id) {
return userDao.get(id).getUserName();
}
}
------其他解决方案--------------------------------------------------------
java.lang.NumberFormatException: null
在格式化的时候报错了
------其他解决方案--------------------------------------------------------
NumberFormatException 异常， 是不是因为传入的值为空？
------其他解决方案--------------------------------------------------------
//action控制器
package com.bjaxt.action;
import java.util.List;
import com.bjaxt.entity.Abc;
import com.bjaxt.services.IAbcServices;