[JEXL-320] "mvn test" fails with COMPILATION ERROR in SynchronizedArithmetic.java on Java 11

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1
• Fix Version/s: 3.2

Environment

JDK: OpenJDK 11 (hotspot)

OS: Ubuntu 18.04.3 LTS

Apache Maven 3.3.9

• Assignee: Henri Biestro
• Reporter: David Costanzo
• Created: 16/Jan/20 20:27
• Updated: 07/Jun/21 13:14
• Resolved: 24/Jan/20 13:08

Description

Running "mvn test" when using OpenJDK's Java 11 fails with the following errors:

[WARNING] COMPILATION WARNING : 
[INFO] -------------------------------------------------------------
[WARNING] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[24,16] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[97,20] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[100,23] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[WARNING] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[102,23] sun.misc.Unsafe is internal proprietary API and may be removed in a future release
[INFO] 4 warnings 
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[63,19] cannot find symbol
  symbol:   method monitorEnter(java.lang.Object)
  location: variable UNSAFE of type sun.misc.Unsafe
[ERROR] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[72,19] cannot find symbol
  symbol:   method monitorExit(java.lang.Object)
  location: variable UNSAFE of type sun.misc.Unsafe
[ERROR] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[113,19] cannot find symbol
  symbol:   method monitorEnter(java.lang.Object)
  location: variable UNSAFE of type sun.misc.Unsafe
[ERROR] /local_static/github/commons-jexl/src/test/java/org/apache/commons/jexl3/SynchronizedArithmetic.java:[118,19] cannot find symbol
  symbol:   method monitorExit(java.lang.Object)
  location: variable UNSAFE of type sun.misc.Unsafe

BUILDING.txt states that JEXL "requires Java 6 (or later)".  I assume that you expect "mvn test" to work with Java 11.  If not, then this is really a doc bug in BUILDING.txt–it should say that it "requires Java 6 (exactly)" or include the range of supported Java versions.

 

Impact

This is a small barrier to entry for a new contributor.  There is an obvious and straight-forward way to get past the problem, which is to download a compatible version of Java and set JAVA_HOME accordingly.  I used Java 1.8, which already had installed on my dev machine.  This prints the same warnings, but no errors.