AbstractJavaProjectConfigurator: Fix NPE if EE has no compliance options

Fixes #1735

Author: sratz

org.eclipse.m2e.jdt/META-INF/MANIFEST.MF

@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %Bundle-Name
 Bundle-SymbolicName: org.eclipse.m2e.jdt;singleton:=true
-Bundle-Version: 2.3.401.qualifier
+Bundle-Version: 2.3.500.qualifier
 Bundle-Localization: plugin
 Export-Package: org.eclipse.m2e.jdt,
  org.eclipse.m2e.jdt.internal;x-friends:="org.eclipse.m2e.jdt.ui",

org.eclipse.m2e.jdt/src/org/eclipse/m2e/jdt/internal/AbstractJavaProjectConfigurator.java

@@ -125,14 +125,17 @@ public abstract class AbstractJavaProjectConfigurator extends AbstractProjectCon
       if(supportedExecutionEnvironmentTypes.stream().filter(type -> eeId.startsWith(type)).findAny().isEmpty()) {
         continue;
       }
-      var compliance = ee.getComplianceOptions().get(JavaCore.COMPILER_COMPLIANCE);
-      if(compliance != null) {
-        sources.add(compliance);
-        targets.add(compliance);
-        if(JavaCore.ENABLED.equals(ee.getComplianceOptions().get(JavaCore.COMPILER_RELEASE))) {
-          releases.add(compliance);
+      Map<String, String> complianceOptions = ee.getComplianceOptions();
+      if(complianceOptions != null) {
+        String compliance = complianceOptions.get(JavaCore.COMPILER_COMPLIANCE);
+        if(compliance != null) {
+          sources.add(compliance);
+          targets.add(compliance);
+          if(JavaCore.ENABLED.equals(complianceOptions.get(JavaCore.COMPILER_RELEASE))) {
+            releases.add(compliance);
+          }
+          ENVIRONMENTS.put(compliance, eeId);
         }
-        ENVIRONMENTS.put(compliance, eeId);
       }
     }