Transaction functions written in java do not work for datomic:mem protocol when application is run in java 11

Datomic On-Prem
#1

Hi, when https://github.com/Datomic/datomic-java-examples is run on java 11 for datomic-free library 0.9.5697 then attempting to execute transaction FN leads to an exception:

Exception in thread "main" java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.NullPointerException
	at datomic.promise$throw_executionexception_if_throwable.invoke(promise.clj:10)
	at datomic.promise$settable_future$reify__6471.deref(promise.clj:54)
	at clojure.core$deref.invoke(core.clj:2206)
	at datomic.promise$settable_future$reify__6471.get(promise.clj:45)

Similar case but for datomic-pro:0.9.5951 leads to:

Caused by: java.util.concurrent.ExecutionException: java.lang.ClassCastException: class org.codehaus.commons.compiler.jdk.ScriptEvaluator cannot be cast to class org.codehaus.commons.compiler.jdk.ClassBodyEvaluator (org.codehaus.commons.compiler.jdk.ScriptEvaluator and org.codehaus.commons.compiler.jdk.ClassBodyEvaluator are in unnamed module of loader 'app')
	at datomic.promise$throw_executionexception_if_throwable.invokeStatic(promise.clj:10)
	at datomic.promise$throw_executionexception_if_throwable.invoke(promise.clj:6)
	at datomic.promise$settable_future$reify__1868.deref(promise.clj:54)
	at clojure.core$deref.invokeStatic(core.clj:2228)
	at clojure.core$deref.invoke(core.clj:2214)
	at datomic.promise$settable_future$reify__1868.get(promise.clj:45)

All the same actions work fine for java11 when protocol datomic:dev is used

2 Likes
#2

Can someone give any thoughts on this issue? Can we expect that not all features are supported by datomic in java 11 environment so far?

#3

Hi nikolayandr,

Can you provide some more information so that we can reproduce this?

  • What program are you running when you encounter these errors?
  • What is the behavior on Java 8?

Thanks,
Stu

#5

Oh sure, sorry for my forget.
Try datomic.samples.Functions#main in java 8 and 11, it is executed successfully for java 8 but there is an error described above for java 11.

To get Caused by: java.util.concurrent.ExecutionException: java.lang.ClassCastException: class org.codehaus.commons.compiler.jdk.ScriptEvaluator cannot be cast to class org.codehaus.commons.compiler.jdk.ClassBodyEvaluator please use datomic-pro instead of datomic-free

#6

Hm, I can’t reproduce issue for java 11 on datomic-pro, please give me some time to determine which exact environment I had when the issues occurred, but still true for datomic-free

#7

Let me explain the app where the issue was firstly met ad summarise what I have so far:

Pre condition: java 11, datomic-on-prem datomic-pro 0.9.5951
We have the app which does similar actions for datomic:dev and datomic:mem dbs. All transactions done for datomic:dev are executed successfully but the same actions fail for datomic:mem. The issue thrown by datomic is: java.lang.ClassCastException: class org.codehaus.commons.compiler.jdk.ScriptEvaluator cannot be cast to class org.codehaus.commons.compiler.jdk.ClassBodyEvaluator

So, having such issue I have decided to reproduce it using datamic-java-examples, but trying java 8 everything was ok, so to have equal envs I have chose to switch to java 11where I got also issue but which is different **Exception in thread “main” java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.NullPointerException
** So I was surprised, but then I realized that datamic-java-examples uses datomic-free library, so after switching to datomic-pro I was surprised again because all is working for datomic-pro. I have question what is wrong, why there is different behaviour for similar envs using similar datomic-pro library for the same test code, the only difference which I see now and can’t explain why the same datomic-pro library uses different commons-compiler-jdk library: datomic-pro in datomic-java-examples downloads commons-compiler-jdk-3.0.12.jar and datomic-pro in my gradle project downloads commons-compiler-jdk-3.1.2.jar.

#8

Ok cool, I know the reason of java.lang.ClassCastException: class org.codehaus.commons.compiler.jdk.ScriptEvaluator cannot be cast to class org.codehaus.commons.compiler.jdk.ClassBodyEvaluator, for some reasons gradle downloads commons-compiler-jdk-3.1.2.jar when datomic-pro:0.9.5951 is configured to use commons-compiler-jdk-3.0.12.jar, so the only open question whether it is possible to run java transactor functions using datomic-free in java 11