JLBench is a tool developed at Rice by Dan Smith to simplify testing of DynamicJava's faithfulness to the Java standard, published as a separate SourceForge project (https://sourceforge.net/projects/jlbench/). .jlbench files are collections of small annotated Java programs and supporting declarations; running a benchmark file verifies that the language behavior (static failure, runtime failure, or success) is consistent with the declared expectation for each program. Benchmarks for standard language behavior are included in (and can be contributed to) jlbench.jar; project-specific tests that exercise DynamicJava-specific features are stored with DynamicJava.