[protege-user] Can't build Protege from Github!

Dear Protege users and team!

I have cloned Protege from Github and tried to build using a command: "mvn
clean package", as of instruction. Process ended with a bunch of errors,
beginning this:
…
Downloaded from central:
https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit4/3.2.5/surefire-junit4-3.2.5.jar
(18 kB at 134 kB/s)
[INFO]
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.protege.osgi.framework.BundleSearchPath_TestCase
[ERROR] Tests run: 3, Failures: 0, Errors: 3, Skipped: 0, Time elapsed:
0.194 s <<< FAILURE! -- in
org.protege.osgi.framework.BundleSearchPath_TestCase
[ERROR]
org.protege.osgi.framework.BundleSearchPath_TestCase.shouldNotAddDuplicate
-- Time elapsed: 0.049 s <<< ERROR!
java.lang.ExceptionInInitializerError
    at
org.mockito.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:167)
    at
org.mockito.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at
org.mockito.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:217)
,,,
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make
protected final java.lang.Class
java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
throws java.lang.ClassFormatError accessible: module java.base does not
"opens java.lang" to unnamed module @2096442d
    at
java.base/java.lang.reflect.AccessibleObject.throwInaccessibleObjectException(AccessibleObject.java:391)
    at
java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:367)
    at
java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:315)
    at
java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:203)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:197)
…
…
[INFO]
[ERROR] Tests run: 34, Failures: 0, Errors: 26, Skipped: 0
[INFO]
[INFO]
------------------------------------------------------------------------
[INFO] Reactor Summary for protege-parent 5.6.8:
[INFO]
[INFO] protege-parent ..................................... SUCCESS [
 3.761 s]
[INFO] protege-launcher ................................... FAILURE [
42.990 s]
[INFO] protege-common ..................................... SKIPPED
[INFO] protege-editor-core ................................ SKIPPED
[INFO] protege-editor-owl ................................. SKIPPED
[INFO] protege-desktop .................................... SKIPPED
[INFO]
------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO]
------------------------------------------------------------------------
[INFO] Total time:  01:11 min
[INFO] Finished at: 2025-10-24T13:15:26+03:00
[INFO]
------------------------------------------------------------------------
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-surefire-plugin:3.2.5:test (default-test) on
project protege-launcher:
[ERROR]
[ERROR] Please refer to
/home/ru/java/protege/protege-launcher/target/surefire-reports for the
individual test results.
[ERROR] Please refer to dump files (if any exist) [date].dump,
[date]-jvmRun[N].dump and [date].dumpstream.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions,
please read the following articles:
[ERROR] [Help 1]
http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the
command
[ERROR]   mvn <args> -rf :protege-launcher

This is the end of the dump.
Any help would be greatly appreciated.

Sincerely,
  Ru

--

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