if(!order_address.equals("")&&order_address != null){

008-7-7 14:09:24 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet customerInfoManagerment threw exception java.lang.NullPointerException at servlet.CustomerInfoManagerment.service(CustomerInfoManagerment.java:72) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Unknown Source)

这个是今天在tomcat下报的一个错误

我找了好一会才弄清“罪魁祸首”

出错代码：

if(!order_address.equals("")&&order_address != null){

````

}

改正后的代码：

if(order_address != null&&!order_address.equals("")){

````

}

总节;

以后判断都得先判断是否为空对象即null，再判断是否为空值""