Axis2 Client Error - NullPointerException at ClientUtils.inferIntTransport

error
java.lang.NullPointerException
at org.apache.axis2.description.ClientUtils.inferInTransport(ClientUtils.java:85)
at org.apache.axis2.description.OutInAxisOperationClient.execute(OutInAxisOperation.java:253)


environment
Attempting to connect to a web service using an Axis2 client.

possible causes:
You are missing a jar in your classpath.

solution
The missing jar is the commons-httpclient.jar. Add this jar to your classpath.

Classpath Problem - javax.xml.stream.FactoryConfigurationError: Provider com.bea.xml.stream.MXParserFactory not found

error
com.bea.xml.stream.MXParserFactory not found

environment
The following xml jars are in my classpath:
xerces.jar - org.apache.*, org.w3c.dom.html.*, org.w3c.dom.ls.*
xercesImpl.jar - com.sun.org.apache.*

possible causes:
You do not have a StAX implementation in your classpath.

solution
You must provide an implementation of StAX in your classpath.

references
http://forums.java.net/jive/thread.jspa?messageID=117971

Secure Copy

Copy local file to remote location:

scp <local-file-path>/<file-name> <username>@<server-name>:<location-from-home-dir>

Copy remote file to local location:

scp <username>@<server-name>:~/<path-to-file>/<file-name> <local-directory-location>

Mule Logging - How to specify a different location for the mule logs

bin/mule script

Create and export an environment variable pointing to your desired log location.

export LOG_DIR=/data/logs/your-desired-log-location

conf/wrapper.conf file

Refer to the environment variable exported in the mule script in the wrapper.logfile property in the wrapper.conf configuration file.

#********************************************************************
# Wrapper Logging Properties
#********************************************************************
......
# Log file to use for wrapper output logging.
wrapper.logfile=%LOG_DIR%/%MULE_APP%.log
......

Running an SSH Tunnel in the background

nohup ssh -v -L <local.port>:<destination.ip>:<destination.port> username@<remote.ip>

Note: You cannot use an alias for the ssh command or else it will not work. You must use the ssh command directly in the nohup command.

Mule Error: Remote Debugging a Mule Server

The article given in Remote Debugging a Mule Server does not work on some operating systems. You must include each JVM option on a separate line as in the following example.

# uncomment this line to debug remotely, the application will wait for the external debugger to connect
# IMPORTANT: change the wrapper.java.additional. parameter to be the actual consecutive number,
# depending on the number of additional parameters above
wrapper.java.additional.4=-Xdebug
wrapper.java.additional.5=-Xnoagent
wrapper.java.additional.6=-Djava.compiler=NONE
wrapper.java.additional.7=-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005

References:
http://mule.codehaus.org/display/MULE/Remote+Debugging+a+Mule+Server
http://www.mail-archive.com/user@mule.codehaus.org/msg04986.html

Migrating from Mule 1.3.3 to Mule 1.4.1

1. Change the MULE_HOME to point to the Mule 1.4.1 home directory.

2. Update the 'mule' script in the bin folder with the Mule 1.4.1 version.