页面打开时报错

鬼画符

页面打开时报：String index out of range: -1 这个错

鬼画符

这是控制台的完整错


2017-06-13 10:46:44 开始-中间文件生成缓存文件: /UI/SJMIS/XMGL/process/SBWBZX/mainActivity.w
2017-06-13 10:46:44 结束-中间文件生成缓存文件: /UI/SJMIS/XMGL/process/SBWBZX/mainActivity.w
2017-06-13 10:46:45 action:<?xml version="1.0" encoding="UTF-8"?>
<action direct-execute="true" process="/SJMIS/XMGL/process/SBWBZX/sBWBZXProcess" activity="mainActivity" action-flag="__action_0__" executor="A0E7BAB0EA3745A6815ADCB6ED0DDAE3" execute-context="" name="querySBNameCodeAction"><parameters xmlns:xbiz="http://www.justep.com/xbiz#"><parameter name="id"><xbiz:simple type="http://www.w3.org/2001/XMLSchema#String"/></parameter></parameters></action>
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.justep.system.action.Engine.invokeActions(Native Method)
        at com.justep.system.action.Engine.invokeActions(Unknown Source)
        at com.justep.business.server.BusinessServer.doAction(Unknown Source)
        at com.justep.business.server.BusinessServer.doExcute(Unknown Source)
        at com.justep.business.server.BusinessServer.excute(Unknown Source)
        at com.justep.business.server.BusinessServer.excute(Unknown Source)
        at com.justep.business.server.BusinessServerServlet.execService(Unknown Source)
        at com.justep.business.server.BusinessServerServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at com.justep.x.bs.BusinessServerServlet.service(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at com.googlecode.psiprobe.Tomcat60AgentValve.invoke(Tomcat60AgentValve.java:40)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1911)
        at XMGL.querySBNameCode(XMGL.java:939)
        ... 28 more

jishuang

Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1911)
        at XMGL.querySBNameCode(XMGL.java:939)

自己写的java代码有问题，java调试看看具体的问题

鬼画符

public static String querySBNameCode(String id){
                String flag="";
                String ksql="select d.* from DM_SBWBZXCB d where d.fZBID='"+id+"'";
                Table table=KSQL.select(ksql, null,"/SJMIS/XMGL/data", null);
                Iterator<Row> rows=table.iterator();
                while(rows.hasNext()){
                        Row row=rows.next();
                        flag=flag+row.getString("fSBBM")+"-"+row.getString("fSBMC")+",";
                }
                return flag.substring(0,flag.length()-1);
               
        }

这是他后台代码，帮我看看这写法有问题吗

jishuang

判断table是否有数据再进行迭代遍历

鬼画符

表中是有数据的，可是我打印出来的flag是空的

jishuang

你定义的flag本来就是空字符串

鬼画符

那定义的flag是空的和这个错误有关系吗

jishuang

没有，上面错误已经指出了是java中第几行空指针了啊，这个就是java标准的错误