Drop support for older Java versions

- Don't propose compilation targets below 1.8 JLS
- don't show old EE's in wizards

Requires eclipse-jdt/eclipse.jdt.debug#452
Requires eclipse-jdt/eclipse.jdt.core#2606
See #1465

org.eclipse.jdt.core.manipulation/META-INF/MANIFEST.MF

@@ -10,10 +10,10 @@ Bundle-Localization: plugin
 Require-Bundle: org.eclipse.core.runtime;bundle-version="[3.31.0,4.0.0)",
  org.eclipse.core.resources;bundle-version="[3.20.0,4.0.0)",
  org.eclipse.ltk.core.refactoring;bundle-version="[3.14.0,4.0.0)",
- org.eclipse.jdt.core;bundle-version="[3.38.0,4.0.0)",
+ org.eclipse.jdt.core;bundle-version="[3.39.0,4.0.0)",
  org.eclipse.core.expressions;bundle-version="[3.9.0,4.0.0)",
  org.eclipse.text;bundle-version="[3.14.0,4.0.0)",
- org.eclipse.jdt.launching;bundle-version="3.21.0",
+ org.eclipse.jdt.launching;bundle-version="3.23.0",
  org.eclipse.core.filesystem;bundle-version="1.10.0",
  org.eclipse.core.filebuffers;bundle-version="3.8.0",
  org.eclipse.search.core;bundle-version="3.16.0"

org.eclipse.jdt.core.manipulation/core extension/org/eclipse/jdt/internal/corext/util/JavaModelUtil.java

@@ -1143,28 +1143,20 @@ public static String getCompilerCompliance(IVMInstall2 vMInstall, String default
 			return JavaCore.VERSION_9;
 		} else if (version.startsWith(JavaCore.VERSION_1_8)) {
 			return JavaCore.VERSION_1_8;
-		} else if (version.startsWith(JavaCore.VERSION_1_7)) {
-			return JavaCore.VERSION_1_7;
-		} else if (version.startsWith(JavaCore.VERSION_1_6)) {
-			return JavaCore.VERSION_1_6;
-		} else if (version.startsWith(JavaCore.VERSION_1_5)) {
-			return JavaCore.VERSION_1_5;
-		} else if (version.startsWith(JavaCore.VERSION_1_4)) {
-			return JavaCore.VERSION_1_4;
-		} else if (version.startsWith(JavaCore.VERSION_1_3)
-				|| version.startsWith(JavaCore.VERSION_1_2)
-				|| version.startsWith(JavaCore.VERSION_1_1)) {
-			return JavaCore.VERSION_1_3;
 		}
-		return JavaCore.isSupportedJavaVersion(version) ? defaultCompliance : JavaModelUtil.VERSION_LATEST;
+		return JavaCore.isJavaSourceVersionSupportedByCompiler(version) ? defaultCompliance : JavaModelUtil.VERSION_LATEST;
 	}
 
 	public static String getExecutionEnvironmentCompliance(IExecutionEnvironment executionEnvironment) {
 		Map<String, String> complianceOptions= executionEnvironment.getComplianceOptions();
 		if (complianceOptions != null) {
 			String compliance= complianceOptions.get(JavaCore.COMPILER_COMPLIANCE);
-			if (compliance != null)
-				return compliance;
+			if (compliance != null) {
+				if(JavaCore.isJavaSourceVersionSupportedByCompiler(compliance)) {
+					return compliance;
+				}
+				return JavaCore.getFirstJavaSourceVersionSupportedByCompiler();
+			}
 		}
 
 		// fallback:
@@ -1199,16 +1191,8 @@ public static String getExecutionEnvironmentCompliance(IExecutionEnvironment exe
 			return JavaCore.VERSION_9;
 		} else if (desc.indexOf(JavaCore.VERSION_1_8) != -1) {
 			return JavaCore.VERSION_1_8;
-		} else if (desc.indexOf(JavaCore.VERSION_1_7) != -1) {
-			return JavaCore.VERSION_1_7;
-		} else if (desc.indexOf(JavaCore.VERSION_1_6) != -1) {
-			return JavaCore.VERSION_1_6;
-		} else if (desc.indexOf(JavaCore.VERSION_1_5) != -1) {
-			return JavaCore.VERSION_1_5;
-		} else if (desc.indexOf(JavaCore.VERSION_1_4) != -1) {
-			return JavaCore.VERSION_1_4;
 		}
-		return JavaCore.VERSION_1_3;
+		return JavaCore.getFirstJavaSourceVersionSupportedByCompiler();
 	}
 
 	/**

org.eclipse.jdt.ui/META-INF/MANIFEST.MF

@@ -97,18 +97,18 @@ Require-Bundle:
  org.eclipse.core.filesystem;bundle-version="[1.2.0,2.0.0)",
  org.eclipse.core.resources;bundle-version="[3.14.0,4.0.0)",
  org.eclipse.core.variables;bundle-version="[3.2.200,4.0.0)",
- org.eclipse.jdt.core;bundle-version="[3.37.0,4.0.0)",
+ org.eclipse.jdt.core;bundle-version="[3.39.0,4.0.0)",
  org.eclipse.search;bundle-version="[3.10.0,4.0.0)",
  org.eclipse.debug.core;bundle-version="[3.10.0,4.0.0)",
  org.eclipse.debug.ui;bundle-version="[3.11.0,4.0.0)",
- org.eclipse.jdt.launching;bundle-version="[3.19.400,4.0.0)",
+ org.eclipse.jdt.launching;bundle-version="[3.23.0,4.0.0)",
  org.eclipse.compare;bundle-version="[3.5.0,4.0.0)",
  org.eclipse.team.ui;bundle-version="[3.4.100,4.0.0)",
  org.eclipse.team.core;bundle-version="[3.4.100,4.0.0)",
  org.eclipse.jface.text;bundle-version="[3.20.0,4.0.0)",
  org.eclipse.ui;bundle-version="[3.117.0,4.0.0)",
  org.eclipse.ui.console;bundle-version="[3.4.0,4.0.0)",
- org.eclipse.ui.workbench;bundle-version="[3.131.0, 4.0.0)",
+ org.eclipse.ui.workbench;bundle-version="[3.131.0,4.0.0)",
  org.eclipse.ui.workbench.texteditor;bundle-version="[3.10.0,4.0.0)",
  org.eclipse.ui.ide;bundle-version="[3.15.0,4.0.0)",
  org.eclipse.ui.views;bundle-version="[3.3.100,4.0.0)",

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javadocexport/JavadocSpecificsWizardPage.java

@@ -18,7 +18,6 @@
 
 import java.io.File;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 
 import org.eclipse.swt.SWT;
@@ -154,8 +153,7 @@ private void createExtraOptionsGroup(Composite composite) {
 		fSourceCombo= createCombo(inner, SWT.NONE, fStore.getSource(), createGridData(1));
 		List<String> versions= new ArrayList<>();
 		versions.add("-"); //$NON-NLS-1$
-		versions.addAll(JavaCore.getAllVersions());
-		versions.removeAll(Arrays.asList(JavaCore.VERSION_CLDC_1_1, JavaCore.VERSION_1_1, JavaCore.VERSION_1_2));
+		versions.addAll(JavaCore.getAllJavaSourceVersionsSupportedByCompiler());
 		fSourceCombo.setItems(versions.toArray(new String[versions.size()]));
 
 		fSourceCombo.setText(fStore.getSource());