diff --git a/jps/jps-builders/src/org/jetbrains/jps/ProjectPaths.java b/jps/jps-builders/src/org/jetbrains/jps/ProjectPaths.java
index 43eceb22bd0c..8ff69c0646d7 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/ProjectPaths.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/ProjectPaths.java
@@ -51,11 +51,6 @@ public class ProjectPaths {
     return getClasspathFiles(chunk, JpsJavaClasspathKind.compile(chunk.containsTests()), excludeMainModuleOutput, ClasspathPart.BEFORE_PLUS_JDK, true);
   }
 
-  @NotNull
-  public static Collection<File> getRuntimeBootClasspath(@NotNull ModuleChunk chunk) {
-    return getClasspathFiles(chunk, JpsJavaClasspathKind.compile(chunk.containsTests()), false, ClasspathPart.BEFORE_JDK, false);
-  }
-
   @NotNull
   public static Collection<File> getCompilationClasspath(ModuleChunk chunk, boolean excludeMainModuleOutput) {
     return getClasspathFiles(chunk, JpsJavaClasspathKind.compile(chunk.containsTests()), excludeMainModuleOutput, ClasspathPart.AFTER_JDK, true);
diff --git a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JointCompilationClassLoader.java b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JointCompilationClassLoader.java
index 8ded22a10c9d..8abb9cf5253f 100644
--- a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JointCompilationClassLoader.java
+++ b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JointCompilationClassLoader.java
@@ -15,6 +15,7 @@
  */
 package org.jetbrains.jps.incremental.groovy;
 
+import com.intellij.util.SystemProperties;
 import com.intellij.util.lang.ClassPath;
 import com.intellij.util.lang.UrlClassLoader;
 import org.jetbrains.annotations.NotNull;
@@ -23,15 +24,23 @@ import org.jetbrains.annotations.NotNull;
  * @author peter
  */
 class JointCompilationClassLoader extends UrlClassLoader {
+  private static final boolean ourExplicitlyAvoidLoadingJava = SystemProperties.getBooleanProperty("groovy.classloader.skip.java.package", true);
   @NotNull private final Builder myBuilder;
   @NotNull private ClassPath myClassPath;
-  
+
   public JointCompilationClassLoader(@NotNull Builder builder) {
     super(builder);
     myBuilder = builder;
     myClassPath = super.getClassPath();
   }
 
+  @Override
+  protected Class findClass(String name) throws ClassNotFoundException {
+    if (ourExplicitlyAvoidLoadingJava && name.startsWith("java.")) return null;
+
+    return super.findClass(name);
+  }
+
   @Override
   protected Class _defineClass(String name, byte[] b) {
     try {
diff --git a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovycRunner.java b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovycRunner.java
index bc76c68268e7..8cc03b0ef4da 100644
--- a/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovycRunner.java
+++ b/plugins/groovy/jps-plugin/src/org/jetbrains/jps/incremental/groovy/JpsGroovycRunner.java
@@ -23,7 +23,6 @@ import com.intellij.openapi.util.Ref;
 import com.intellij.openapi.util.SystemInfo;
 import com.intellij.openapi.util.io.FileUtil;
 import com.intellij.openapi.util.text.StringUtil;
-import com.intellij.util.SystemProperties;
 import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.containers.MultiMap;
 import org.jetbrains.annotations.NotNull;
@@ -389,11 +388,8 @@ public abstract class JpsGroovycRunner<R extends BuildRootDescriptor, T extends
     // IMPORTANT! must be the first in classpath
     cp.addAll(GroovyBuilder.getGroovyRtRoots());
 
-    if (SystemProperties.getBooleanProperty("groovyc.include.jdk.into.compilation.classpath", false)) {
-      addFilePaths(cp, ProjectPaths.getCompilationClasspathFiles(chunk, chunk.containsTests(), false, false));
-    } else {
-      addFilePaths(cp, ProjectPaths.getRuntimeBootClasspath(chunk));
-      addFilePaths(cp, ProjectPaths.getCompilationModulePath(chunk, false));
+    for (File file : ProjectPaths.getCompilationClasspathFiles(chunk, chunk.containsTests(), false, false)) {
+      cp.add(FileUtil.toCanonicalPath(file.getPath()));
     }
 
     for (GroovyBuilderExtension extension : JpsServiceManager.getInstance().getExtensions(GroovyBuilderExtension.class)) {
@@ -403,12 +399,6 @@ public abstract class JpsGroovycRunner<R extends BuildRootDescriptor, T extends
     return cp;
   }
 
-  private static void addFilePaths(Set<String> cp, Collection<File> files) {
-    for (File file : files) {
-      cp.add(FileUtil.toCanonicalPath(file.getPath()));
-    }
-  }
-
   private Map<String, String> buildClassToSourceMap(ModuleChunk chunk, CompileContext context, Set<String> toCompilePaths, Map<T, String> finalOutputs) throws IOException {
     final Map<String, String> class2Src = new HashMap<String, String>();
     JpsJavaCompilerConfiguration configuration = JpsJavaExtensionService.getInstance().getOrCreateCompilerConfiguration(