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Why exec-maven-plugin fails while java console command works?

This problem has arisen while working with the Java Chromium Embedded Framework (JCEF).
The JCEF uses a native SO library (libcef.so) and a SO library for the JNI bindings (libjcef.so). I believe the embedded Chromium looks for a file named icudtl.dat next to it, i.e. in the same directory that the libraries reside.
For the following explanation, asume that all those required files are in the same directory, named jcef_libs.
I wrote a test application using JCEF. After compiling, if I execute it with the java command, i.e.
$ export LD_LIBRARY_PATH=/path/to/jcef_libs
$ java -cp src/main/java:/path/to/maven/repo/jcef.jar:/path/to/maven/repo/jogl-all/2.2.4/*:/path/to/maven/repo/gluegen-rt/2.2.4/* tests.simple.MainFrame
it works flawlessly.
On the other hand, using the exec-maven-plugin raises a fatal error, due to not finding the named icudtl.dat file. The POM file is configured to use exactly the same artifacts as the java command does.
$ mvn exec:java -Dexec.mainClass="tests.simple.MainFrame"
[1201/123038:FATAL:content_main_runner.cc(721)] Check failed: base::i18n::InitializeICU().
I have tested the java command with the icudtl.dat file removed from the jcef_libs directory, experiencing the same error, i.e. the error raises only when the icudtl.dat is not found.
Any help will be appreciated.
UPDATE
I have been tracing what maven does under the hood. The failing mvn command above executes this internally:
java -classpath /usr/share/maven2/boot/classworlds.jar -Dclassworlds.conf=/usr/share/maven2/bin/m2.conf -Dmaven.home=/usr/share/maven2 org.codehaus.classworlds.Launcher "exec:java" "-Dexec.mainClass=tests.simple.MainFrame"
I.e. it executes my test application through a launcher. I don't know where this launcher is going to execute my application but, again, I need the icudtl.dat in that directory.
Any idea how could I workaround this?

How to run ZooInspector from Windows

Here's what I did:
Downloaded Apache ZooKeeper 3.4.6 (.tar file), extracted to C:\cygwin\home\user\zookeeper-3.4.6\
Ran ant at the root of the ZooKeeper folder (C:\cygwin\home\user\zookeeper-3.4.6)
Navigated to C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\
Ran ant, and I get the following error:
Output:
Buildfile: C:\cygwin\home\Jean\zookeeper-3.4.6\contrib\ZooInspector\build.xml
BUILD FAILED
C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\build.xml:19: Cannot find C:\cygwin\home\user\zookeeper-3.4.6\contrib\build-contrib.xml imported from C:\cygwin\home\user\zookeeper-3.4.6\contrib\ZooInspector\build.xml
Total time: 0 seconds
This leaves me with no .cmd or .sh file to execute. How come the build-contrib.xml file isn't there?
Also, I noticed that there seems to be an already-compiled ZooInspector JAR file: zookeeper-3.4.6-ZooInspector.jar. However, attempting to run it with the following command yields failure too:
$ java -cp zookeeper-3.4.6-ZooInspector.jar:lib/* org.apache.zookeeper.inspector.ZooInspector
Error: Could not find or load main class org.apache.zookeeper.inspector.ZooInspector
This is a bit frustrating -- setting up the ZooKeeper server was straightforward but for some reason I just can't figure out how to run this standalone GUI. What am I missing?

For windows:
#echo off
set cp="./*;./lib/*;../../*;../../lib/*"
java -cp %cp% org.apache.zookeeper.inspector.ZooInspector

ZooInspector 3.4.6 (that's bundled with ZooKeeper 3.4.6) doesn't seem to be able to connect to a running ZooKeeper instance on Windows.
Better use zkui:
https://github.com/echoma/zkui/wiki/Download

zooInspector just need 3 libraries and 1 jar to load the main class.
the mainclass lives zookeeper-3.3.0-ZooInspector.jar and it needs jtoaster-1.0.4.jar, zookeeper-3.3.0.jar and finally log4j-1.2.15.jar
After download the tar.gz file from apache servers, you must untar and build with ant. finally copy the zookeeper-3.3.0.jar and log4j-1.2.15.jar to contrib/ZooInspector/lib/. Finally cd to contrib/ZooInspector and launch this command
java -jar zookeeper-3.3.0-ZooInspector.jar -cp lib/*

I met the same issue today, and created a pre-compiled version, which should work on Windows as well. You can find details here:
https://www.admon.org/scripts/zooinspector-zookeeper-graphic-interface/

Running Rake Tasks In WAS without JRuby

Related to : Executing rake tasks on an exploded war on tomcat without jruby being installed
I'm trying to run rake tasks in my Tomcat server that doesn't have JRuby installed. I'm using warbler to create a war file.
Using the answer to the linked question, I ran:
java -cp lib/jruby-core*.jar:lib/jruby-stdlib*.jar org.jruby.Main -S rake -T
This gets me the error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/jruby/Main
Caused by: java.lang.ClassNotFoundException: org.jruby.Main
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
ls lib gets me:
ems-gems-activerecord-jdbc-adapter-1.2.2-lib-arjdbc-jdbc-adapter_java.jar
gems-gems-jdbc-sqlite3-3.7.2-lib-sqlite-jdbc-3.7.2.jar
gems-gems-jruby-jars-1.6.8-lib-jruby-core-1.6.8.jar
gems-gems-jruby-jars-1.6.8-lib-jruby-stdlib-1.6.8.jar
gems-gems-jruby-rack-1.1.10-lib-jruby-rack-1.1.10.jar
gems-gems-json-1.7.5-java-lib-json-ext-generator.jar
gems-gems-json-1.7.5-java-lib-json-ext-parser.jar
gems-gems-therubyrhino_jar-1.7.4-jar-rhino-1.7R4.jar
gems-gems-warbler-1.3.6-lib-warbler_jar.jar
jruby-core-1.6.8.jar
jruby-rack-1.1.10.jar
jruby-stdlib-1.6.8.jar
ojdbc6.jar
Opening up the jruby-core-1.6.8.jar file, I can see that there is indeed a org/jruby/Main.class file.
As one can see from the file listing, there is no jruby-complete jar file, so I can't run the command from https://stackoverflow.com/a/9982556/684934
What am I doing wrong, and is there by now a better way to do this?

I was working on a similar problem 2 months ago, so things may have changed, but I needed to include all the jars in my class path, had to use bin stubs, and had to set GEM_HOME to get everything working. It may have been simpler, but the posts you referenced didn't work for me either.
I actually had jruby installed, (but I was only using it to build the concatenated class path), so my setup was something like:
cd /path/to/application/
export GEM_HOME=/path/to/application/gems
export CLASSPATH=$(jruby -e 'puts Dir["lib/*.jar"].join(":")')
RAILS_ENV=production java -cp $CLASSPATH org.jruby.Main bin/rake -T
Also useful, the jruby-jars gem can be included in your gemfile to set the version of jruby that warbler includes (I was using gem 'jruby-jars', '1.7.0.preview2' as 1.7.0 wasn't released yet)

Having Problems Getting FreeTTS and JSAPI Working

First off I'm on Ubuntu linux if that matters.
I have a simple project idea based off of FreeTTS and the JSAPI (Java Speech API)
I've downloaded and unpacked FreeTTS and run their build script. Then tried compiling my code linking several jar's required in the lib directory into the class path like this:
javac -cp /home/travis/Desktop/freetts-1.2/lib/jsapi.jar:/home/travis/Desktop/freetts-1.2/lib/freetts.jar HelloUnleashedReader.java
Which then compiles to java bytecode just fine.
However when I run:
java HelloUnleashedReader
I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/speech/EngineModeDesc
Any help on this issue would be greatly appreciated as there are many sites around the net discussing problems with getting it to work but not many that discuss their solution.

I see that you are using Ubuntu. You must agree to the binary license before you can use jsapi.jar. You agree to this license in the process of unpacking it. To unpack jsapi.jar in Ubuntu you would type the following:
cd ~/Desktop/freetts-1.2/lib
chmod +x ./jsapi.sh
./jsapi.sh
if you receive a message like
"./jsapi.sh: 1428: uudecode: not found"
then install uudecode with
sudo apt-get install sharutils
and try again

You need to add the jsapi.jar into your classpath. The jsapi.jar can be unpacked by running lib/jsapi.exe inside the freetts installation directory.

I got this error despite I had jsapi.jar on classpath.
java -cp `ls *.jar | awk '{ORS=":";print}'` -jar WebStartClock.jar
What helped me was specifying the main class explicitely:
java -cp `ls *.jar | awk '{ORS=":";print}'` JSAPIClock
Probably something wrong in the JAR metadata or so.

Running a jar from shell script

I have a jar file named umar.jar in /root/umar/bin directory. I have a shell script file run.sh in same directory. Following is the content of run.sh
#!/bin/bash
"$JAVA_HOME"/bin/java -jar /root/umar/bin/umar.jar
Now when I run the shell script, I get the following error
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
After some googling, I found (as a folk from stackoverflow mentioned) that such errors occur when the Jar was compiled with a later version of the JDK than your JRE.
Now strange thing is, if I run this command directly on shell
java -jar umar.jar
it works perfectly fine. If the jar was compiled with a later version of JDK than my JRE, it shouldn't have had run at all even from the shell.
What do you suggest?

compare "java -version " and ""$JAVA_HOME"/bin/java -version"
You probably have multiple JVMs installed

As already mentioned - you're trying to use byte code compiled by the later compiler with old jvm.
Please note that if your PATH contains multiple java executables of different versions you can switch between them easily using '-version' key.
Suppose you have java5 and java6 at your PATH and java5 is located before java6 there. You can see that java5 is used by default then (if you execute 'java -version' it prints corresponding information). However, you can start java6 easily using command like 'java -version:1.6 ...' (e.g. if you execute 'java -version:1.6 -version' you see that java6 is used).

Export the java and jre home which you need to use in your sh file.
Run the jar using the exported java home
e.g
export JAVA_HOME=/opt/java6
export JRE_HOME=/opt/java6/jre
/opt/java6/bin/java -Xms2048m -Xmx2048m -jar abc.jar $1