diff --git a/base/org.codehaus.groovy30/src/org/codehaus/groovy/vmplugin/v8/Java8.java b/base/org.codehaus.groovy30/src/org/codehaus/groovy/vmplugin/v8/Java8.java
index c4f933a0ad..e713390a89 100644
--- a/base/org.codehaus.groovy30/src/org/codehaus/groovy/vmplugin/v8/Java8.java
+++ b/base/org.codehaus.groovy30/src/org/codehaus/groovy/vmplugin/v8/Java8.java
@@ -56,6 +56,7 @@
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.GenericSignatureFormatError;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.MalformedParameterizedTypeException;
 import java.lang.reflect.Member;
@@ -438,9 +439,11 @@ public void configureClassNode(final CompileUnit compileUnit, final ClassNode cl
                 setAnnotationMetaData(clazz.getPackage().getAnnotations(), packageNode);
             }
         } catch (NoClassDefFoundError e) {
-            throw new NoClassDefFoundError("Unable to load class " + classNode.toString(false) + " due to missing dependency " + e.getMessage());
-        } catch (MalformedParameterizedTypeException e) {
-            throw new RuntimeException("Unable to configure class node for class " + classNode.toString(false) + " due to malformed parameterized types", e);
+            throw new NoClassDefFoundError("Unable to configure " + classNode.getName() + " due to missing dependency " + e.getMessage());
+        } catch (TypeNotPresentException e) {
+            throw new NoClassDefFoundError("Unable to configure " + classNode.getName() + " due to missing dependency " + e.typeName());
+        } catch (GenericSignatureFormatError | MalformedParameterizedTypeException e) {
+            throw new RuntimeException(    "Unable to configure " + classNode.getName() + " due to malformed type info" , e);
         }
     }
 
diff --git a/base/org.codehaus.groovy40/src/org/codehaus/groovy/vmplugin/v8/Java8.java b/base/org.codehaus.groovy40/src/org/codehaus/groovy/vmplugin/v8/Java8.java
index e92bd3ceb5..e25f1eabe9 100644
--- a/base/org.codehaus.groovy40/src/org/codehaus/groovy/vmplugin/v8/Java8.java
+++ b/base/org.codehaus.groovy40/src/org/codehaus/groovy/vmplugin/v8/Java8.java
@@ -59,6 +59,7 @@
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.GenericSignatureFormatError;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.MalformedParameterizedTypeException;
 import java.lang.reflect.Member;
@@ -448,9 +449,11 @@ public void configureClassNode(final CompileUnit compileUnit, final ClassNode cl
                 setAnnotationMetaData(clazz.getPackage().getAnnotations(), packageNode);
             }
         } catch (NoClassDefFoundError e) {
-            throw new NoClassDefFoundError("Unable to load class " + classNode.toString(false) + " due to missing dependency " + e.getMessage());
-        } catch (MalformedParameterizedTypeException e) {
-            throw new RuntimeException("Unable to configure class node for class " + classNode.toString(false) + " due to malformed parameterized types", e);
+            throw new NoClassDefFoundError("Unable to configure " + classNode.getName() + " due to missing dependency " + e.getMessage());
+        } catch (TypeNotPresentException e) {
+            throw new NoClassDefFoundError("Unable to configure " + classNode.getName() + " due to missing dependency " + e.typeName());
+        } catch (GenericSignatureFormatError | MalformedParameterizedTypeException e) {
+            throw new RuntimeException(    "Unable to configure " + classNode.getName() + " due to malformed type info" , e);
         }
     }
 
diff --git a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
index 1eff4ed0ca..a67cac10d5 100644
--- a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
+++ b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/internal/compiler/ast/GroovyCompilationUnitDeclaration.java
@@ -299,7 +299,7 @@ public boolean processToPhase(int phase) {
             if (GroovyLogManager.manager.hasLoggers()) {
                 GroovyLogManager.manager.log(TraceCategory.COMPILER, e.getMessage());
             }
-            if (!alreadyHasErrors) {
+            if (!alreadyHasErrors && compilationUnit.allowTransforms) {
                 Util.log(new Status(IStatus.ERROR, Activator.PLUGIN_ID, "Groovy compiler error", e));
             }
             // probably an AST transform compiled against a different Groovy
diff --git a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/model/GroovyCompilationUnit.java b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/model/GroovyCompilationUnit.java
index 28a912d257..8ccb3e1a5b 100644
--- a/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/model/GroovyCompilationUnit.java
+++ b/base/org.eclipse.jdt.groovy.core/src/org/codehaus/jdt/groovy/model/GroovyCompilationUnit.java
@@ -347,7 +347,7 @@ protected boolean buildStructure(OpenableElementInfo info, IProgressMonitor pm,
                 if (e.getStatus().getCode() != IJavaModelStatusConstants.ELEMENT_DOES_NOT_EXIST || getJavaProject().exists()) {
                     Util.log(e, "Problem with build structure for " + this.name);
                 }
-            } catch (Exception e) {
+            } catch (Exception | LinkageError | AssertionError e) {
                 // The groovy compiler doesn't handle broken code well in many situations
                 // use this general catch clause so that exceptions thrown by broken code
                 // do not bubble up the stack.
diff --git a/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/editor/GroovyAwareFoldingStructureProvider.java b/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/editor/GroovyAwareFoldingStructureProvider.java
index a44bde57af..e0a35c4fce 100644
--- a/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/editor/GroovyAwareFoldingStructureProvider.java
+++ b/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/editor/GroovyAwareFoldingStructureProvider.java
@@ -70,24 +70,27 @@ public void uninstall() {
     @Override
     protected void computeFoldingStructure(final IJavaElement element, final FoldingStructureComputationContext context) {
         // NOTE: be sure to call super.computeFoldingStructure when editor is null to preserve Java behavior
-        if (editor != null && editor.getModuleNode() != null) {
-            if (isMainType(element)) {
-                // add folding for multi-line closures
-                computeClosureFoldingStructure(element, context);
+        try {
+            if (editor != null && editor.getModuleNode() != null) {
+                if (isMainType(element)) {
+                    // add folding for multi-line closures
+                    computeClosureFoldingStructure(element, context);
 
-                // TODO: add folding for multi-line strings or array/list/map literals?
-            } else if (isScriptMethod(element)) {
-                // add folding for multi-line comments
-                computeCommentFoldingStructure(element, context);
+                    // TODO: add folding for multi-line strings or array/list/map literals?
+                } else if (isScriptMethod(element)) {
+                    // add folding for multi-line comments
+                    computeCommentFoldingStructure(element, context);
 
-                // TODO: add folding for top-level types?
+                    // TODO: add folding for top-level types?
 
-                return; // prevent folding of entire script body
-            }
+                    return; // prevent folding of entire script body
+                }
 
-            if (element instanceof IType) {
-                computeTraitMethodFoldingStructure((IType) element, context);
+                if (element instanceof IType) {
+                    computeTraitMethodFoldingStructure((IType) element, context);
+                }
             }
+        } catch (Exception | LinkageError | AssertionError ignore) {
         }
         super.computeFoldingStructure(element, context);
     }
diff --git a/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/refactoring/actions/OrganizeGroovyImports.java b/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/refactoring/actions/OrganizeGroovyImports.java
index c9b1f051e9..3d4c62967a 100644
--- a/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/refactoring/actions/OrganizeGroovyImports.java
+++ b/ide/org.codehaus.groovy.eclipse.ui/src/org/codehaus/groovy/eclipse/refactoring/actions/OrganizeGroovyImports.java
@@ -258,8 +258,8 @@ public TextEdit calculateMissingImports() {
                 TextEdit rewrite = rewriter.rewriteImports(monitor.split(1));
                 trace("%s", rewrite);
                 return rewrite;
-            } catch (Exception e) {
-                GroovyPlugin.getDefault().logError("Exception thrown when organizing imports for " + unit.getElementName(), e);
+            } catch (Exception | LinkageError | AssertionError e) {
+                GroovyPlugin.getDefault().logError("Organize imports failed for " + unit.getElementName(), e);
             } finally {
                 importsSlatedForRemoval = null;
                 missingTypes = null;