clear java bean info cache every 100 tests

platform/testFramework/src/com/intellij/testFramework/LightPlatformTestCase.java

@@ -94,7 +94,7 @@ import com.intellij.psi.impl.source.tree.injected.InjectedLanguageManagerImpl;
 import com.intellij.psi.templateLanguages.TemplateDataLanguageMappings;
 import com.intellij.testFramework.fixtures.impl.CodeInsightTestFixtureImpl;
 import com.intellij.util.Consumer;
-import com.intellij.util.IncorrectOperationException;
+import com.intellij.util.GCUtil;import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.LocalTimeCounter;
 import com.intellij.util.containers.ContainerUtil;
 import com.intellij.util.indexing.FileBasedIndex;
@@ -590,7 +590,15 @@ public abstract class LightPlatformTestCase extends UsefulTestCase implements Da
       checkEditorsReleased();
     }
     documentManager.clearUncommittedDocuments();
+    
+    if (ourTestCount++ % 100 == 0) {
+      // some tests are written in Groovy, and running all of them may result in some 40M of memory wasted on bean infos
+      // so let's clear the cache every now and then to ensure it doesn't grow too large
+      GCUtil.tryClearBeanInfoCache();
+    }
   }
+  
+  private static int ourTestCount = 0;
 
   public static PsiDocumentManagerImpl clearUncommittedDocuments(@NotNull Project project) {
     PsiDocumentManagerImpl documentManager = (PsiDocumentManagerImpl)PsiDocumentManager.getInstance(project);

platform/testFramework/src/com/intellij/util/GCUtil.java

@@ -81,7 +81,12 @@ public class GCUtil {
 
   private static final boolean ourHasBeanInfoCache = SystemInfo.isJavaVersionAtLeast("1.7");
 
-  private static void tryClearBeanInfoCache() {
+  /**
+   * Using java beans (e.g. Groovy does it) results in all referenced class infos being cached in ThreadGroupContext. A valid fix
+   * would be to hold BeanInfo objects on soft references, but that should be done in JDK. So let's clear this cache manually for now, 
+   * in clients that are known to create bean infos. 
+   */
+  public static void tryClearBeanInfoCache() {
     if (ourHasBeanInfoCache) {
       try {
         Class<?> aClass = Class.forName("java.beans.ThreadGroupContext");