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Generally you will want to pull a tagged release of the products based on the version you want to develop/baseline with. Most active development takes place on the trunk (unlike the situation with the V2 Java projects), though branches may exist at times if we're actively working across two minor versions.
These projects are not available through git yet; you must use svn.
To get the OpenSAML code, if necessary:
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Currently, all of the Shibboleth Java developers use Eclipse for development. In These projects are not available through git yet; you must use svn. In addition to the material under Java Developer's Guide, the following may be useful:
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