log4j:ERROR A org.apache.log4j (FileAppender) object is not assignable to a org.apache.log4j (Appender) variable

Problem:
When deploying an ear file including log4j.jar into Glassfish3.x, following Exception is thrown:

Solution:
Add log4j.jar to Glassfish lib, e.g. /domains/mydomain/lib/ext or /glassfish/lib and remove it from ear.

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Hibernate Search and Glassfish

Problem:
Using Hibernate Search in combination with Glassfish throws following Exception:

Solution:
Add an additional

to your persitence.xml in order to use Hibernate JPA for Persistence Management.

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Change default URL for PostfixAdmin

Problem:
PostfixAdmin per default is reachable via yourhost.address/postfixadmin. This is certainly not optimal in terms of security.

Solution:
Edit /etc/postfixadmin/apache.conf
from

to something like
After that, reload apache configuration.

Message-Driven Beans, Message not send / received

Problem:
When sending a message via JMS (transactions enabled) this message is not received by other MessageListener.

Solution:
Add an additional session.commit(); before closing the session.

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javax.jms.JMSException: no valid constructor

Problem:
Deserialization causes Exception.

Solution:

  1. Make sure all your classes, that are send trhough the wire, implement java.io.Serializable
  2. If your class extends other class(es), first class in inheritance tree, that does not implement java.io.Serializable, must provide a zero-argument standard-constructor!

Maven2 settings.xml

Maven2 settings.xml is located in ~/.m2/settings.xml and looks like this: