Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [[javac] error: Source option 1.3 is no longer supported. Use 8 or later./builddir/build/BUILD/bsf-2.4.0-build/bsf-2.4.0/build.xml:219: Compile failed; see the compiler error output for details.]: [Ant build failure related to javac tool.]

Issue: The version of javac used during the build does not support the source flag 1.3.
Resolution: Inspect the build.xml file and set the appropriate key referring to the java source flag to a version supported by the compiler.