Develop Reference

Get full stack trace message of Axis2

I am writing a Java EE web application using Tomcat and Axis2 on Eclipse EE.
There is an error in the code, and I can't get the full stack trace to debug it.
I am doing a JDBC connection, and something fails. When I do this using a normal main function it works, but through the Tomcat/Axis2 it does not work.
Caused by: java.lang.NullPointerException
at merge.Test.testQuery(Test.java:36)
... 35 more
How can I expand these 35 lines?
I have set to true the following options in axis2.xml:
true
true
Also I enabled the following option in log4j.properties:
log4j.rootCategory=INFO, CONSOLE, LOGFILE
but I haven't found any log files in the apache directory, or in the axis2 directory, or in the projects directory.
Any help would be greatly appreciated.
Thanks.

You should be able to see the log on the standard output as well.
On Eclipse, just click the following button:
It will switch to the Tomcat's output.

How to disable AspectJ dump files "ajcore.txt"

I've got a Tomcat webapp where I'm using AspectJ for logging and metrics, everything seems fine, but it keep creating several files like ajcore.20150310.113255.780.txt in the root folder. There is no exception in this files, so they are completely useless.
I've found this: https://eclipse.org/aspectj/doc/released/pdguide/ajcore.html
That states that using org.aspectj.weaver.Dump.exception="false" should disable this behavior, yet the files are still appearing. Is there any other way to completely disable the creation of this files? The other option mentioned: org.aspectj.dump.directory would also solve the problem, but it doesn't seem to work either.
This is the content of the file in case it helps for anything:
---- AspectJ Properties ---
AspectJ Compiler 1.7.1 built on Thursday Sep 6, 2012 at 16:39:22 GMT
---- Dump Properties ---
Dump file: ajcore.20150310.113255.780.txt
Dump reason: org.aspectj.weaver.BCException
Dump on exception: true
Dump at exit condition: abort
---- Exception Information ---
---- System Properties ---
... My system properties here
---- Command Line --- Empty
---- Full Classpath --- Empty
---- Compiler Messages --- Empty

Either of the following options may help:
Executing this code before any AspectJ weaving occurs (if possible): org.aspectj.weaver.Dump.setDumpOnExit(org.aspectj.bridge.IMessage.ABORT)
Adding this system property definition to your java command-line: -Dorg.aspectj.weaver.Dump.condition=abort

I think it is good that the AJ core dump happens because something seems to go wrong during LTW compilation:
Dump file: ajcore.20150310.113255.780.txt
Dump reason: org.aspectj.weaver.BCException
So there is an exception and you should investigate and fix it. Maybe some of your classes are woven with the logging code correctly and some are not. Run the weaver in verbose mode and check your console output, maybe you see something strange there. An AJ core file means that the weaver/compiler was shut down completely (abnormal termination).
As for the actual problem, I think that this
---- Command Line --- Empty
looks strange, as if no command line parameters were passed to the weaver. Also that no exception is actually logged is really unusual.
Which Java version are you on? I assume Java 7 because 1.6 is really old and Java 8 needs AspectJ 1.8. Anyway, can you try to use the latest AspectJ version 1.8.5 or at least the latest 1.7.4 from the old release and see if the problem still occurs?

Add this argument to your JVM run: -Dorg.aspectj.weaver.Dump.exception=false
And also see official docs

Errors when configuring Apache Nutch crawler

I am having some trouble running Nutch on a Linux server. I am trying to crawl URLs configured in seed.txt, but I am seeing the following errors. The crawler is triggered as follows
nohup java -classpath "./common-conf/*:*:./plugins/*:" -jar crawler-jar-2.0-SNAPSHOT.jar &
In this configuration, all the configuration properties are present in common-conf directory. We have some custom configuration that we have set up in our Crawler binary. As a result, we have built a custom binary and don't use standard Apache nutch crawler. I see the following issues:
Our custom nutch-default.xml and nutch-site.xml are not picked from the common-conf classpath directory. They are being picked up from nutch jar file. When I print out the URL path for the both the xmls, I see something like this
nutch default =
jar:file:/home/nbsxlwa/crawler/lib/nutch-2.2.1.jar!/nutch-default.xml
nutch site =
jar:file:/home/nbsxlwa/crawler/lib/nutch-2.2.1.jar!/nutch-site.xml
I want the files to be picked up from classpath. I can verify that the files exist.
Our custom gora.properties is not being picked up. I see the following log trace
14/08/22 07:18:24 WARN store.DataStoreFactory: gora.properties not found, properties will be empty.
14/08/22 07:18:24 INFO crawl.InjectorJob: InjectorJob: Using class org.apache.gora.memory.store.MemStore as the Gora storage class.
gora.properties exists in the classpath and I am not sure why it is not being picked up.
/home/nbsxlwa/crawler/ find . -name "gora.properties"
./common-conf/gora.properties
http.agent.name configuration property is not being picked up. I can confirm that the configuration exists in nutch-site.xml
The stack trace is given below.
14/08/22 07:18:36 ERROR fetcher.FetcherJob: Fetcher: No agents listed in 'http.agent.name' property.
14/08/22 07:18:36 WARN crawl.Crawler: Error running crawler job for configuration. Tool run command raises an exception
java.lang.IllegalArgumentException: Fetcher: No agents listed in 'http.agent.name' property.
at org.apache.nutch.fetcher.FetcherJob.checkConfiguration(FetcherJob.java:252)
at org.apache.nutch.fetcher.FetcherJob.run(FetcherJob.java:160)
at org.apache.nutch.crawl.Crawler.runTool(Crawler.java:78)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:176)
at org.apache.nutch.crawl.Crawler.run(Crawler.java:266)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.nutch.crawl.Crawler.main(Crawler.java:356)
regex-normalize.xml and regex-urlfilter.txt are not being picked up from the classpath. I can confirm that the files exist in my classpath. The stack trace is given below
/home/nbsxlwa/crawler : find . -name "regex-normalize.xml"
./common-conf/regex-normalize.xml
/home/nbsxlwa/crawler : find . -name "regex-urlfilter.txt"
./common-conf/regex-urlfilter.txt
14/08/22 07:18:29 INFO conf.Configuration: regex-normalize.xml not found
14/08/22 07:18:29 WARN regex.RegexURLNormalizer: Can't load the default rules!
14/08/22 07:18:29 INFO conf.Configuration: regex-urlfilter.txt not found
14/08/22 07:18:29 INFO conf.Configuration: regex-normalize.xml not found
14/08/22 07:18:29 WARN regex.RegexURLNormalizer: Can't load the default rules!
I have gone through the following links to see where I am going wrong. How do I set up Nutch configuration settings here?
http://mail-archives.apache.org/mod_mbox/nutch-user/201202.mbox/%3CCAGaRif3rtJHokgG5FHSbnJLLUAVGiDnfx7JaW-7kiBjx_ivwSg#mail.gmail.com%3E and
http://osdir.com/ml/user.nutch.apache/2012-02/msg00127.html

I know this is old, but thought it may help someone in the future:
Have you tried to run:
ant runtime
run it from the nutch folder after you changed the config values.

GWT debug in Intellij Idea

I'm trying to set up 'GWT configuration' in IntelliJ Idea using JBoss 5.1 as my server.
I add a new GWT configuration in the DevMode parameters I give this:
-noserver -startupUrl http://localhost:8080/ -logLevel INFO -codeServerPort 9997 -war "C:\Users\user\Documents\IdeaProjects\project\ru.project.maven\frontend\target\frontend-2.0.1-SNAPSHOT" ru.project.frontend.Frontend
After launch the debug configuration I am getting this in the console:
Dev Mode initialized. Startup URL: http://localhost:8080/?gwt.codesvr=127.0.0.1:9997
But when I access the page using that URL I get only background of my page.
Also I get:
Connection received from 127.0.0.1:52435
in log when trying to start the page.
Point is that in eclipse the same project debugs fine. DevMod parameters is mostly the same except this:
-remoteUI "${gwt_remote_ui_server_port}:${unique_id}"
when I add this parameter in Idea it gives me error:
A port must be an integer Google Web Toolkit 2.5.1
Does anybody know how to configure debug in Idea in this situation?

Add also -nosuperDevMode as this defaults to ON(superDevMode)
This param is not mentioned in gwtproject but you can try add any not correct param and try launch. Intellij IDEA will tell you all available params.

log4j logging to catalina.out in unix instead of log file

In my web application I am inititalizing logging in my web application by using the PropertyConfigurator.configure(filepath) function in a servlet which is loaded on startup.
String log4jfile = getInitParameter("log4j-init-file");
if (log4jfile != null) {
String propfile = getServletContext().getRealPath(log4jfile);
PropertyConfigurator.configure(propfile);
I have placed my log4j.properties file in WEB_INF/classes directory and am specifying the file as
log4j.appender.rollingFile.File=${catalina.home}/logs/myapp.log
My root logger was initally configured as:
log4j.rootLogger=DEBUG, rollingFile,console
(I believe the console attribute also logs the statements into catalina.out)
In windows the logging seems to occor normally with the statements appearing in the log file.
In unix my logging statements are being redirected to the catalina.out instead of my actual log file(Which contains only logs from the initalization servlet). All subsequent logs show up in catalina.out.
This leads me to believe that my log4j is not getting set properly but I am unable to figure out the cause. Could anyone help me figure out where the problem might be.
Thanks in advance,
Fell

It may be a permissions problem - check the owners and permissions of the ${catalina.home}/logs directory.

It will depend on the server you are using.
Is it Tomcat? Is it the same version on Windows and on Linux?

Check whether you have set CATALINA_HOME environmental variable in your machine.
You can check it in linux by typing 'echo $CATALINA_HOME'.