Investigate tests disabled during transition to minimal 1.8 target

[iloveeclipse]

Commit https://github.com/eclipse-jdt/eclipse.jdt.core/commit/1bcb15a140b9989d0f33b2552989af431376ede7 disabled few failing tests that started to fail after changing minimal compilation level to 1.8 in https://github.com/eclipse-jdt/eclipse.jdt.core/pull/2551

Some of disabled tests have already own tickets, the rest must be analyzed & either tests updated or removed or code fixed.

To find tests in the workspace, just search for _2551_. Current list has 42 matches, here the overview:

• [ ] ASTConverter15JLS4Test.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (2 matches)
• [ ] ASTConverter15JLS8Test.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (2 matches)
• [ ] ASTConverter15Test.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (2 matches)
• [ ] ASTConverter17Test.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (6 matches)
• [ ] ASTConverter18Test.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (2 matches)
• [ ] ASTConverterTest2.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom
• [ ] ASTConverterTestAST4_2.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom (7 matches)
• [ ] AttachSourceTests.java - https://github.com/eclipse-jdt/eclipse.jdt.core/issues/2754
• [ ] BatchASTCreationTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/dom
• [ ] ClasspathTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model
• [ ] CompletionTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model
• [ ] Compliance_1_4.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression (2 matches)
• [ ] Compliance_CLDC.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression
• [ ] CopyMoveResourcesTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model
• [ ] GenericTypeTest.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression (2 matches)
• [ ] Java50Tests.java - org.eclipse.jdt.core.tests.builder/src/org/eclipse/jdt/core/tests/builder
• [ ] JavadocTest_1_3.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression
• [ ] JavadocTest_1_4.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression (3 matches)
• [ ] JavaSearchBugsTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model
• [ ] MultiProjectTests.java - org.eclipse.jdt.core.tests.builder/src/org/eclipse/jdt/core/tests/builder
• [ ] NullAnnotationBatchCompilerTest.java - org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression
• [ ] NullAnnotationModelTests.java - https://github.com/eclipse-jdt/eclipse.jdt.core/issues/2756
• [ ] SearchTests.java - org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model