Fix exception getting source position for library file

idea/src/org/jetbrains/jet/plugin/debugger/JetPositionManager.java

@@ -115,7 +115,7 @@ public class JetPositionManager implements PositionManager {
         JvmClassName className = JvmClassName.byInternalName(referenceInternalName);
 
         Project project = myDebugProcess.getProject();
-        return DebuggerUtils.findSourceFileForClass(project, GlobalSearchScope.allScope(project), className, sourceName);
+        return DebuggerUtils.findSourceFileForClass(project, GlobalSearchScope.allScope(project), className, sourceName, location.lineNumber() - 1);
     }
 
     @NotNull

idea/src/org/jetbrains/jet/plugin/filters/JetExceptionFilter.java

@@ -64,7 +64,7 @@ public class JetExceptionFilter implements Filter {
         String internalName = fullyQualifiedName.replace('.', '/');
         JvmClassName jvmClassName = JvmClassName.byInternalName(internalName);
 
-        JetFile file = DebuggerUtils.findSourceFileForClass(project, searchScope, jvmClassName, fileName);
+        JetFile file = DebuggerUtils.findSourceFileForClass(project, searchScope, jvmClassName, fileName, element.getLineNumber() - 1);
 
         if (file == null) return null;
         VirtualFile virtualFile = file.getVirtualFile();

idea/src/org/jetbrains/jet/plugin/util/DebuggerUtils.java

@@ -19,17 +19,25 @@ package org.jetbrains.jet.plugin.util;
 import com.google.common.base.Predicate;
 import com.google.common.collect.Collections2;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.roots.libraries.LibraryUtil;
 import com.intellij.psi.search.GlobalSearchScope;
+import com.intellij.psi.util.PsiTreeUtil;
+import kotlin.Function1;
+import kotlin.KotlinPackage;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.analyzer.AnalyzeExhaust;
 import org.jetbrains.jet.codegen.binding.PsiCodegenPredictor;
+import org.jetbrains.jet.lang.psi.JetElement;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.resolve.java.JvmClassName;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.plugin.caches.resolve.ResolvePackage;
+import org.jetbrains.jet.plugin.codeInsight.CodeInsightUtils;
+import org.jetbrains.jet.plugin.debugger.DebuggerPackage;
 
 import java.util.Collection;
+import java.util.List;
 
 import static org.jetbrains.jet.plugin.stubindex.PackageIndexUtil.findFilesWithExactPackage;
 
@@ -41,8 +49,9 @@ public class DebuggerUtils {
     public static JetFile findSourceFileForClass(
             @NotNull Project project,
             @NotNull GlobalSearchScope searchScope,
-            @NotNull JvmClassName className,
-            @NotNull final String fileName
+            @NotNull final JvmClassName className,
+            @NotNull final String fileName,
+            final int lineNumber
     ) {
 
         FqName packageFqName = getPackageFqNameForClass(className);
@@ -66,6 +75,26 @@ public class DebuggerUtils {
             return file;
         }
 
+        boolean isInLibrary = KotlinPackage.any(filesWithExactName, new Function1<JetFile, Boolean>() {
+            @Override
+            public Boolean invoke(JetFile file) {
+                return LibraryUtil.findLibraryEntry(file.getVirtualFile(), file.getProject()) != null;
+            }
+        });
+
+        if (isInLibrary) {
+            return KotlinPackage.singleOrNull(KotlinPackage.filter(filesWithExactName, new Function1<JetFile, Boolean>() {
+                @Override
+                public Boolean invoke(JetFile file) {
+                    Integer startLineOffset = CodeInsightUtils.getStartLineOffset(file, lineNumber);
+                    assert startLineOffset != null : "Cannot find start line offset for file " + file.getName() + ", line " + lineNumber;
+                    JetElement elementAt = PsiTreeUtil.getParentOfType(file.findElementAt(startLineOffset), JetElement.class);
+                    return elementAt != null &&
+                           className.getInternalName().equals(DebuggerPackage.findPackagePartInternalNameForLibraryFile(elementAt));
+                }
+            }));
+        }
+
         // In the rare case that there's more than one file with this name in this package,
         // we may actually need to analyze the project in order to find a file which produces this class
         // TODO: this code is not entirely correct, because it takes a session for only one file