Fix javac memory leak

See apache/maven-mvnd#897

Author: gnodet

plexus-compilers/plexus-compiler-javac/src/main/java/org/codehaus/plexus/compiler/javac/JavacCompiler.java

@@ -443,6 +443,11 @@ else if ( !suppressSource( config ) )
             args.add( value );
         }
 
+        if ( !config.isFork() )
+        {
+            args.add( "-XDuseUnsharedTable=true" );
+        }
+
         return args.toArray( new String[0] );
     }
 

plexus-compilers/plexus-compiler-javac/src/test/java/org/codehaus/plexus/compiler/javac/AbstractJavacCompilerTest.java

@@ -326,6 +326,9 @@ public void testJRuntimeArguments()
         expectedArguments.add( "-source" );
         expectedArguments.add( "1.3" );
 
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         // customCompilerArguments
         Map<String, String> customCompilerArguments = new LinkedHashMap<>();
         customCompilerArguments.put( "-J-Duser.language=en_us", null );
@@ -367,6 +370,9 @@ public void testModulePathAnnotations() throws Exception
         expectedArguments.add( "--release" );
         expectedArguments.add( "9" );
 
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments, source);
     }
 
@@ -395,6 +401,9 @@ public void testModulePath() throws Exception
         expectedArguments.add( "-source" );
         expectedArguments.add( "1.3" );
 
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments );
     }
 
@@ -421,6 +430,9 @@ public void testModuleVersion()
         expectedArguments.add( "--module-version" );
         expectedArguments.add( "1.2.0-SNAPSHOT" );
 
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments );
     }
 
@@ -440,7 +452,10 @@ public void testReleaseVersion()
         compilerConfiguration.setReleaseVersion( "6" );
         expectedArguments.add( "--release" );
         expectedArguments.add( "6" );
-        
+
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments );
     }
 
@@ -465,7 +480,10 @@ public void testFailOnWarning()
         expectedArguments.add( "1.1" );
         expectedArguments.add( "-source" );
         expectedArguments.add( "1.3" );
-        
+
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments );
     }
 
@@ -494,7 +512,10 @@ public void testMultipleAddExports()
         compilerConfiguration.addCompilerCustomArgument( "--add-exports", "FROM-MOD/package2=OTHER-MOD" );
         expectedArguments.add( "--add-exports" );
         expectedArguments.add( "FROM-MOD/package2=OTHER-MOD" );
-        
+
+        // unshared table
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
+
         internalTest( compilerConfiguration, expectedArguments );
     }
 
@@ -639,5 +660,7 @@ private void populateArguments( CompilerConfiguration compilerConfiguration, Lis
         expectedArguments.add( "foo" );
 
         expectedArguments.add( "bar" );
+
+        expectedArguments.add( "-XDuseUnsharedTable=true" );
     }
 }