自定义action执行报错

我是小菜鸡

自定义action报错：
2016-08-24 11:21:12 Action[crzd/crzd/getExchangeMoreCount]执行失败，null
java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        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 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.NullPointerException
        at crzd.Crzd.getExchangeMoreCount(Crzd.java:36)
        at crzd.Crzd__do.getExchangeMoreCount(Crzd__do.java:1931)
        ... 20 more
com.justep.baas.action.ActionException: Action[crzd/crzd/getExchangeMoreCount]执行失败，null
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        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 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.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        ... 16 more
Caused by: java.lang.NullPointerException
        at crzd.Crzd.getExchangeMoreCount(Crzd.java:36)
        at crzd.Crzd__do.getExchangeMoreCount(Crzd__do.java:1931)
        ... 20 more
八月 24, 2016 11:21:12 上午 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet WeX5_Baas_Servlet threw exception
java.lang.NullPointerException
        at crzd.Crzd.getExchangeMoreCount(Crzd.java:36)
        at crzd.Crzd__do.getExchangeMoreCount(Crzd__do.java:1931)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.action.Engine.execAction(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.execService(Unknown Source)
        at com.justep.baas.servlet.BaasServlet.service(Unknown Source)
        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 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)

我是小菜鸡

Java方法：
        public static JSONObject getExchangeMoreCount(JSONObject params, ActionContext context) throws SQLException, NamingException {
                String searchCondition = params.getString("searchCondition");

                Connection conn = context.getConnection(DATASOURCE_CRZD);
                try {
                        String sql = "SELECT sum(cast(StockCount as int)) FROM V_ReceiveSubNewS where " + searchCondition;
                        JSONObject ret = new JSONObject();
                        int count = Integer.parseInt(DataUtils.getValueBySQL(conn, sql, null).toString());
                        ret.put("count", count);
                        return ret;
                } finally {
                        conn.close();
                }
        }

我是小菜鸡

找到原因了，是因为DataUtils.getValueBySQL(conn, sql, null)查询为空时返回null，不能变换