i am fairly new in java and currently working in Struts 1.3. My question is more related with java.
Following is the scenario and i am not sure regarding the best approach to be followed.
I want to make a error reporting functionality in my project where in I'm copying stacktrace and inserting it in the database's table say "errorlog" table with type of exception,date, user etc and other fields. But now what i have to do is :
I have to identify the package name, file, method and line number in which the exception occurred with the help of server logs that i have when exception occurs.
But the problem is that the log gives you the exception, file and the line number but it also contains errors that are not in my packages as in HttpServlet.service(HttpServlet.java:710) etc given below:
java.lang.NullPointerException
com.candidate.query.CandSearchAction.execute(CandSearchAction.java:34)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
org.apache.struts.action.RequestProcessor.proc ess(RequestProcessor.java:274)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
In above case, i got a null pointer exception in my CandSearchAction.java line number 34.
Now i want to know how to differentiate or extract only the line that points to my java/jsp file, so that i can filter them accordingly.
Can anyone please help regarding this situation or how to approach this problem.. is there any library that i can use or anything that could help me.
Waiting for a response that would help me.
If your code follows the same basic structure you used in your example, you could parse the stack trace for anything starting with 1 of your package names and only use those lines.
Related
I implemented a kinesis stream consumer client using node wrapper and getting this MultiLangDaemon execution error as shown below.
Starting MultiLangDaemon ... java.lang.IllegalArgumentException: No enum constant software.amazon.kinesis.common.InitialPositionInStream.TRIM_HORIZON at java.lang.Enum.valueOf(Enum.java:238) at software.amazon.kinesis.common.InitialPositionInStream.valueOf(InitialPositionInStream.java:21) at software.amazon.kinesis.multilang.config.MultiLangDaemonConfiguration$2.convert(MultiLangDaemonConfiguration.java:208) at org.apache.commons.beanutils.ConvertUtilsBean.convert(ConvertUtilsBean.java:491) at org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:1007) at software.amazon.kinesis.multilang.config.KinesisClientLibConfigurator.lambda$getConfiguration$0(KinesisClientLibConfigurator.java:65) at java.lang.Iterable.forEach(Iterable.java:75) at java.util.Collections$SynchronizedCollection.forEach(Collections.java:2064) at software.amazon.kinesis.multilang.config.KinesisClientLibConfigurator.getConfiguration(KinesisClientLibConfigurator.java:63) at software.amazon.kinesis.multilang.MultiLangDaemonConfig.<init>(MultiLangDaemonConfig.java:101) at software.amazon.kinesis.multilang.MultiLangDaemonConfig.<init>(MultiLangDaemonConfig.java:74) at software.amazon.kinesis.multilang.MultiLangDaemonConfig.<init>(MultiLangDaemonConfig.java:58) at software.amazon.kinesis.multilang.MultiLangDaemon.buildMultiLangDaemonConfig(MultiLangDaemon.java:171) at software.amazon.kinesis.multilang.MultiLangDaemon.main(MultiLangDaemon.java:220) No enum constant software.amazon.kinesis.common.InitialPositionInStream.TRIM_HORIZON
I already cross checked properties file with details shown below listed there
initialPositionInStream, processingLanguage,streamName,executableName etc.
TRIM_HORIZON is set as value for initialPositionInStream Not sure why software.amazon.kinesis.common.InitialPositionInStream this object missing this value?
I am using node consumer client as mentioned here
https://docs.aws.amazon.com/streams/latest/dev/kinesis-record-processor-implementation-app-nodejs.html
Just want to help community by answering this specific error fix. It was .properties file update for that respective parameter key name. Although I am getting couple of other java.lang.RuntimeException that will try to resolve and ask for resolution in separate threads.
I've test my apps using elasticsearch with very simple line of code. Like this :
Node node = nodeBuilder()
.settings(Settings.settingsBuilder().put("cluster.name", "elasticsearch").put("clster.transport.sniff", true).put("path.home", "/home/kenny/Program/Java/elastic"$
.node();
But I got error like this :
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:113)
at org.elasticsearch.node.internal.InternalSettingsPreparer.randomNodeName(InternalSettingsPreparer.java:198)
at org.elasticsearch.node.internal.InternalSettingsPreparer.finalizeSettings(InternalSettingsPreparer.java:177)
at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:101)
at org.elasticsearch.node.Node.<init>(Node.java:128)
at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:145)
at org.elasticsearch.node.NodeBuilder.node(NodeBuilder.java:152)
at TryElastic.main(TryElastic.java:56)
I don't know how to solve this problem, I've try and looking for the solution. Line 56 at error log, refer to ".node()" method above. So, dou you have suggestion or there are something that I've to add in my code
Thanks.....
The only way this can happen is due to a misconfiguration of path.home.
When Elasticsearch tries to generate a random node name for your instance, it looks for a file at {path.home}/config/names.txt
If the file cannot be found, you'll get a (rather unfriendly and unhelpful) NullPointerException.
So the solution is to check that "/home/kenny/Program/Java/elastic" is really the top-level of an ES installation.
See here for docs on the correct directory layout.
My JDMK based application is getting intermittent IOExceptions at line 313 in com.sun.jdmk.comm.HttpSendSocket and I can't figure out why. All I know from the Javadoc about this is if an I/O error occurs while creating the input stream you'll get an IOException, but I don't know what kind of I/O error occurred or why one did. The code actually worked both before and after this error transpired.
Any tips on how to debug this intermittent problem would be appreciated.
I don't want to paste the source code here for HttpSendSocket since it belongs not to me, but I know it's doing an HttpURLConnection conn.getInputStream() when the IOException exception is thrown.
I thought about trying to create my own version of HttpSendSocket, and adding diagnostics in it, but couldn't figure out how since it's a package protected class.
Stack trace below:
com.sun.jdmk.comm.CommunicationException: java.io.IOException: HTTP request failed
at com.sun.jdmk.comm.HttpSendSocket.readNotify(HttpSendSocket.java:313)
at com.sun.jdmk.comm.HttpSendInputStream.read(HttpSendInputStream.java:95)
at java.io.FilterInputStream.read(FilterInputStream.java:94)
at java.io.PushbackInputStream.read(PushbackInputStream.java:150)
at com.sun.jdmk.comm.GenericHttpConnectorClient.sendHttp(GenericHttpConnectorClient.java:486)
at com.sun.jdmk.comm.GenericHttpConnectorClient.invokeRemoteOperation(GenericHttpConnectorClient.java:2234)
at com.sun.jdmk.comm.GenericHttpConnectorClient.invoke(GenericHttpConnectorClient.java:1366)
As I said, any helpful suggestions would be appreciated.
The communication Exception was caused by using ArrayList method subList. ArrayList is serializable but subList data IS NOT serializable, and therefore you cannot retrieve the data over an HttpConnector. The solution was to change:
List<UserProcessInfo> values = new ArrayList<UserProcessInfo>();
...
values.size() <= 1000 ? values : values.subList(0,1000);
to:
List<UserProcessInfo> values = new ArrayList<UserProcessInfo>();
...
return values.size() <= 1000 ? values : new ArrayList<UserProcessInfo>(values.subList(0,1000));
Attach the JDMK source to your IDE, then set a breakpoint in the HttpSendSocket and run it with debugging enabled. At least in IntelliJ you can attach the library source by trying to open the class from the stacktrace, then choosing to link source. Don't know how the process is for other IDE's but I would expect it to be possible.
We are getting a mustache play error in production (amazon linux EC2 AMI) but not in development (MACs) and we have tried upgrading the jvm, using the jdk instead, and changing from a tomcat deploy model to match our development environments as much as possible but nothing is working. Please any help would be greatly appreciated. We have lots of shared code in java and javascript using mustache and it would be a big deal to rewrite everything if we had to ditch mustache on the java side.
20:48:52,403 ERROR ~
#6al2dd0po
Internal Server Error (500) for request GET /mystuff/people
Execution exception (In {module:mustache-0.2}/app/play/modules/mustache/MustacheTags.java around line 32)
NullPointerException occured : null
play.exceptions.JavaExecutionException
at play.templates.BaseTemplate.throwException(BaseTemplate.java:90)
at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:257)
at play.templates.Template.render(Template.java:26)
at play.templates.GroovyTemplate.render(GroovyTemplate.java:187)
at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:24)
at play.mvc.Controller.renderTemplate(Controller.java:660)
at play.mvc.Controller.renderTemplate(Controller.java:640)
at play.mvc.Controller.render(Controller.java:695)
at controllers.MyStuff.people(MyStuff.java:183)
at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:548)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:502)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:478)
at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:473)
at play.mvc.ActionInvoker.invoke(ActionInvoker.java:161)
at Invocation.HTTP Request(Play!)
Caused by: java.lang.NullPointerException
at play.modules.mustache.MustacheTags._template(MustacheTags.java:32)
at play.modules.mustache.MustacheTags$_template.call(Unknown Source)
at /app/views/User/people.html.(line:22)
at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:232)
... 13 more
Seems the issue is with the threadlocal. In Prod as per my logs, the session gets initialized with the main thread.
[2012-06-30 18:35:38,102] INFO 10097[**main**] - Mustache module initialized
However, MustacheTag tries to access with various thread like this during request.
[2012-06-30 17:48:44,669] INFO 66048[**play-thread-1**] - [{module:mustache-0.2}/app/play/modules/mustache/MustacheTags.java:46] _meta() :: MustachePlugin.session():null
So I changed the implementation of MustachePlugin like this.Changed line commented out:
//private static ThreadLocal<MustacheSession> session_ = new ThreadLocal<MustacheSession>();
private static MustacheSession _session = null;
public static MustacheSession session(){
//return session_.get();
return _session;
}
public void onConfigurationRead(){
// some code
_session = new MustacheSession(compiler, root);
// some code
}
And it is working fine now in prod mode! I see no reason why it should have been in a ThreadLocal in the first place as the session gets initialized at startup!
your issue is difficult to reproduce so i'll give few pointers here. you have tried to eliminate of issue being env issue. so other possible issues could be
data issue: many times reason for production issue is usually difference in actual data and test data. check if its data issue which is casuing NPE.
code issue: Is there something at people.html.(line:22) causing issue. first try removing / altering that to check if thats causing issue. Or can you get source code of mustache (exact version which you are using) and see what object its trying to create and where its failing.
Properties file for different environments: do you have different proprties file for each env? If yes, have u missed on any property for prod env?
You have a NullPointerException on MustacheTags.java at line 32.
This means that you are probably calling a method of the Mustache library and passing a null value.
Try logging all the parameters you transfer to this method (MyStuff.java line 183?).
You can look at the source code of MustacheTags here, it might help you understand what values you are passing and what should be passed.
we are getting this error at the end of running application. I search in google buti don't know what cause this error and what this means. What to do and how to solve it?
i even don't know what raise this exception...
Exception breakpoint occurred at line 145 of EventDispatchThread.java.
java.lang.NullPointerException:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at oracle.jbo.uicli.jui.JUTableBinding$JUTableModel$2.run(JUTableBinding.java:1209)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Don't know what kind of searches you have performed on Google. I would suggest looking up each error (or rather each class where error occurs). Starting from the beginning as subsequent errors may be a due to error propagation. Two searches for EventDispatchThread and JUTableBinding.java may provide some insight at what went wrong.
http://www.docjar.org/docs/api/java/awt/EventDispatchThread.html
It seems that this class deals with AWT components ("takes events off the EventQueue and dispatches them to the appropriate AWT components")
For the JUTableBinding.java there are quite a few pages that say about NullPointerException
https://forums.oracle.com/forums/thread.jspa?threadID=515213
https://forums.oracle.com/forums/thread.jspa?threadID=2343921
https://kr.forums.oracle.com/forums/thread.jspa?threadID=503593
Some of them say that the problem may be with jdk version (seems 1.6 and above throw errors). I would assume that may be the case. Try to recompile using earlier versions of jdk and check whether error is still there. If it is not this then we will investigate further.
"I've looked into the code and found out that JUTableBinding.JUTableModel calls
mScrollUnit = control.getScrollableUnitIncrement(null,
SwingConstants.VERTICAL, 0);
(Line 947)
This was okay in Java 5, since JTable's getScrollableUnitIncrement just returned the row height."
"I changed the line to:
mScrollUnit = control.getScrollableUnitIncrement(
control.getVisibleRect(), SwingConstants.VERTICAL, 0);
and everything works fine on Java 6..."
Hope it helps.