I was looking at this question on stackoverflow and thought I'd try to run the benchmark myself. I downloaded caliper and compiled it successfully using maven. I then compiled HashCodeBenchmark from the linked question successfully using the jar that maven created. However, when I try to run HashCodeBenchmark, java complains that it cannot find a entrypoint class inside the jar.
I am utterly perplexed and have no idea what the problem is.
compile:
$ javac benchmark/HashCodeBenchmark.java \
-classpath caliper-1.0-beta-SNAPSHOT-all.jar \
&& echo success
success
run:
$ java benchmark.HashCodeBenchmark -classpath caliper-1.0-beta-SNAPSHOT-all.jar
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/caliper/runner/CaliperMain
at benchmark.HashCodeBenchmark.main(HashCodeBenchmark.java:64)
Caused by: java.lang.ClassNotFoundException: com.google.caliper.runner.CaliperMain
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 1 more
You're providing the -classpath
argument after the class name - so it's just being passed to your main
method. You need to provide it before the class name, and include the current directory in the classpath too:
$ java -classpath caliper-1.0-beta-SNAPSHOT-all.jar:. benchmark.HashCodeBenchmark