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Java Code shall be formatted according Code Conventions for the Java Programming Language by Sun Microsystems, Inc.
Additional, indentations shall be done by (4)spaces, instead of tabs.Eclipse 3.2 - and I guess also other Java IDEs - provides a Code Formatter option according the Java Convention by Sun. You may import the Eclipse Code Formatter Profile Java Conventions without tabs, which differs from Eclipse's build-in Java Convention Formatter Profile only by the Indentation Tab policy modified from Mixed to Spaces only
See Eclipse IDE Configuration on setting these standard in Eclipse.
Documentation of commitments in JIRA
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Unless previously decided and stated, dcm4che sub-projects shall maintain compatibility with JDK 5.0. The exception is dcm4che14, which remains at a 1.4 compatibility for now. dcm4che2, dcm4chee 2.x. dcm4chee 3.x and Xero are able to use JDK 5. Read this thread in the forums for more discussion.
Eclipse IDE Configuration
If you're using Eclipse to work on dcm4che, follow the instructions on Eclipse IDE Configuration to make sure you're on par with the standards.