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I just "discovered" that we have two Meta-Inf folders ... In eclipse and also in the War file.
The First one is (in the war):
/META-INF/
The Second, and weird one ist:
/WEB-INF/classes/META-INF/
In the second folder is a persistance.xml and a something.taglib.xml...
If i move the files into the first meta-inf folder i get exceptions from hibernate..
What is the purpose of this second and oddly placed meta-inf folder ?
Is this a normal folder structure ?
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The META-INF folder is the home for the MANIFEST. MF file. This file contains meta data about the contents of the JAR. For example, there is an entry called Main-Class that specifies the name of the Java class with the static main() for executable JAR files.
By default, Maven generated archives include the META-INF/maven directory, which contains the pom. xml file used to build the archive, and a pom. properties file that includes some basic properties in a small, easier to read format.
The META-INF directory is private and can't be accessed from the outside. On the other hand, it also contains the WEB-INF public directory with all the static web resources, including HTML pages, images, and JS files. Moreover, it contains the web. xml file, servlet classes, and libraries.
Jar files are used by all types of java applications, they have a specific structure – the META-INF folder contains the manifest information and other metadata about the java package carried by the jar file.
The "weird one" location is correct; JSR-220/JSR-317 (Java Persistence API 1.0/2.0) in section 6.2/8.2 say:
The jar file or directory whose META-INF directory contains the persistence.xml file is termed the root of the persistence unit. In Java EE, the root of a persistence unit may be one of the following:
- an EJB-JAR file
- the WEB-INF/classes directory of a WAR file
- a jar file in the WEB-INF/lib directory of a WAR file
- a jar file in the root of the EAR*
- a jar file in the EAR library directory
- an application client jar file.
*) Only valid for JPA 1.0
So, directly in a WAR file, the only correct location is WEB-INF/classes/META-INF/.
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