my function is as follow and NPE is thrown @ db = new Database("db")
var executeQuery = function(queryString) {
var results ;
var db = null;
try{
db = new Database("db");// error here
results = db.query(queryString);
} catch (e) {
log.error(e);
throw "Error while accessing database
" + " : " + e.message;
}finally{
if(db!=null){
db.close();
log.info("db closed");
}
}
return results;
}
Ishara Cooray
Senior Software Engineer
Mobile : +9477 262 9512
WSO2, Inc. | http://wso2.com/
Lean . Enterprise . Middleware
On Thu, Aug 28, 2014 at 6:48 PM, Ishara Cooray <[email protected]> wrote:
> I have a function which does
> 1. create Database connection
> 2. execute query
> 3. close the db connection
>
>
> var executeQuery = function(queryString) {
> var results ;
> var db = null;
> try{
> var db = new Database("db");
> results = db.query(queryString);
> } catch (e) {
> log.error(e);
> throw "Error while accessing database
> " + " : " + e.message;
> }finally{
> if(db!=null){
> db.close();
> log.info("db closed");
> }
> }
> return results;
> }
>
> i use this function when a sql is needed to be executed.
> But in some cases, when try to create new Database connection it gives
> below NullPointer Exception
>
> [2014-08-28 18:19:46,849] ERROR {JAGGERY.modules.database.dataaccess:jag}
> - org.mozilla.javascript.WrappedException: Wrapped
> java.lang.NullPointerException
> (/cloudmgt/modules/database/dataaccess.jag#21)
> at
> org.mozilla.javascript.Context.throwAsScriptRuntimeEx(Context.java:1754)
> at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:148)
> at org.mozilla.javascript.FunctionObject.call(FunctionObject.java:392)
> at org.mozilla.javascript.BaseFunction.construct(BaseFunction.java:343)
> at
> org.mozilla.javascript.ScriptRuntime.newObject(ScriptRuntime.java:2349)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.database.c0._c_anonymous_1(/cloudmgt/modules/database/dataaccess.jag:21)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.database.c0.call(/cloudmgt/modules/database/dataaccess.jag)
> at
> org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2430)
> at
> org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:269)
> at
> org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:97)
> at
> org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.database.c2._c_anonymous_2(/cloudmgt/modules/database/module.jag:8)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.database.c2.call(/cloudmgt/modules/database/module.jag)
> at
> org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0._c_getTenantDisplayName_3(/cloudmgt/modules/tenant/users/add/add.jag:63)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0.call(/cloudmgt/modules/tenant/users/add/add.jag)
> at
> org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:63)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0._c_anonymous_6(/cloudmgt/modules/tenant/users/add/add.jag:132)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0.call(/cloudmgt/modules/tenant/users/add/add.jag)
> at
> org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:63)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0._c_sendUserInvite_8(/cloudmgt/modules/tenant/users/add/add.jag:213)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.users.add.c0.call(/cloudmgt/modules/tenant/users/add/add.jag)
> at
> org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2430)
> at
> org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:269)
> at
> org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:97)
> at
> org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.c0._c_anonymous_8(/cloudmgt/modules/tenant/module.jag:26)
> at
> org.jaggeryjs.rhino.cloudmgt.modules.tenant.c0.call(/cloudmgt/modules/tenant/module.jag)
> at
> org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0._c_anonymous_1(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag:82)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0.call(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag)
> at
> org.mozilla.javascript.optimizer.OptRuntime.call0(OptRuntime.java:23)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0._c_script_0(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag:6)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0.call(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag)
> at
> org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394)
> at
> org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0.call(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag)
> at
> org.jaggeryjs.rhino.cloudmgt.site.blocks.tenant.users.add.ajax.c0.exec(/cloudmgt/site/blocks/tenant/users/add/ajax/add.jag)
> at
> org.jaggeryjs.scriptengine.engine.RhinoEngine.execScript(RhinoEngine.java:570)
> at
> org.jaggeryjs.scriptengine.engine.RhinoEngine.exec(RhinoEngine.java:273)
> at
> org.jaggeryjs.jaggery.core.manager.WebAppManager.execute(WebAppManager.java:432)
> at
> org.jaggeryjs.jaggery.core.JaggeryServlet.doPost(JaggeryServlet.java:29)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at
> org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
> at
> org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
> at
> org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
> at
> org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
> at
> org.jaggeryjs.jaggery.core.JaggeryFilter.doFilter(JaggeryFilter.java:21)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
> at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
> at
> org.wso2.carbon.tomcat.ext.valves.CompositeValve.continueInvocation(CompositeValve.java:178)
> at
> org.wso2.carbon.tomcat.ext.valves.CarbonTomcatValve$1.invoke(CarbonTomcatValve.java:47)
> at
> org.wso2.carbon.webapp.mgt.TenantLazyLoaderValve.invoke(TenantLazyLoaderValve.java:56)
> at
> org.wso2.carbon.tomcat.ext.valves.TomcatValveContainer.invokeValves(TomcatValveContainer.java:47)
> at
> org.wso2.carbon.tomcat.ext.valves.CompositeValve.invoke(CompositeValve.java:141)
> at
> org.wso2.carbon.tomcat.ext.valves.CarbonStuckThreadDetectionValve.invoke(CarbonStuckThreadDetectionValve.java:156)
> at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
> at
> org.wso2.carbon.tomcat.ext.valves.CarbonContextCreatorValve.invoke(CarbonContextCreatorValve.java:52)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
> at
> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
> at
> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1653)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:722)
> Caused by: java.lang.NullPointerException
> at
> org.jaggeryjs.hostobjects.db.DatabaseHostObject.jsConstructor(DatabaseHostObject.java:87)
> 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:601)
> at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:126)
> ... 72 more
>
>
> Is there a way to synchronize the function in Jaggery or any other
> suggestion to get rid from this error?
>
> Any help would be appreciated.
>
> Thanks.
> Ishara Cooray
> Senior Software Engineer
> Mobile : +9477 262 9512
> WSO2, Inc. | http://wso2.com/
> Lean . Enterprise . Middleware
>
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