Program: 51190
Project: 51190
Buggy source:
private void saveAsMenuItemActionPerformed(java.awt.event.ActionEvent evt){
  JInternalFrame jf=desktopPane.getSelectedFrame();
  if (jf.getContentPane().getComponent(0) instanceof SchemaExplorer) {
    SchemaExplorer se=(SchemaExplorer)jf.getContentPane().getComponent(0);
    java.io.File schemaFile=se.getSchemaFile();
    java.io.File oldSchemaFile=schemaFile;
    java.io.File suggSchemaFile=new File(schemaFile,se.getSchema().name.trim() + "String_Node_Str");
    MondrianGuiDef.Schema schema=se.getSchema();
    JFileChooser jfc=new JFileChooser();
    MondrianProperties.instance();
    jfc.setSelectedFile(suggSchemaFile);
    if (jfc.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
      try {
        schemaFile=jfc.getSelectedFile();
        if (!oldSchemaFile.equals(schemaFile) && schemaFile.exists()) {
          int answer=JOptionPane.showConfirmDialog(null,getResourceConverter().getFormattedString("String_Node_Str","String_Node_Str",new String[]{schemaFile.getAbsolutePath()}),getResourceConverter().getString("String_Node_Str","String_Node_Str"),JOptionPane.YES_NO_OPTION);
          if (answer == 1) {
            return;
          }
        }
        if (se.isNewFile() && !oldSchemaFile.equals(schemaFile)) {
          oldSchemaFile.delete();
        }
        if (se.isNewFile()) {
          se.setNewFile(false);
        }
        se.setDirty(false);
        se.setDirtyFlag(false);
        XMLOutput out=new XMLOutput(new java.io.FileWriter(jfc.getSelectedFile()));
        schema.displayXML(out);
        se.setSchemaFile(schemaFile);
        se.setTitle();
        setLastUsed(jfc.getSelectedFile().getName(),jfc.getSelectedFile().toURI().toURL().toString());
        JMenuItem sMenuItem=(JMenuItem)schemaWindowMap.get(jf);
        String mtexttokens[]=sMenuItem.getText().split("String_Node_Str");
        sMenuItem.setText(mtexttokens[0] + "String_Node_Str" + se.getSchemaFile().getName());
        updateMDXCatalogList();
      }
 catch (      Exception ex) {
        LOGGER.error(ex);
      }
    }
  }
}

Fixed version (ground truth):
private void saveAsMenuItemActionPerformed(java.awt.event.ActionEvent evt){
  JInternalFrame jf=desktopPane.getSelectedFrame();
  if (jf != null && jf.getContentPane().getComponent(0) instanceof SchemaExplorer) {
    SchemaExplorer se=(SchemaExplorer)jf.getContentPane().getComponent(0);
    java.io.File schemaFile=se.getSchemaFile();
    java.io.File oldSchemaFile=schemaFile;
    java.io.File suggSchemaFile=new File(schemaFile == null ? se.getSchema().name.trim() + "String_Node_Str" : schemaFile.getName());
    MondrianGuiDef.Schema schema=se.getSchema();
    JFileChooser jfc=new JFileChooser();
    MondrianProperties.instance();
    jfc.setSelectedFile(suggSchemaFile);
    if (jfc.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
      try {
        schemaFile=jfc.getSelectedFile();
        if (!oldSchemaFile.equals(schemaFile) && schemaFile.exists()) {
          int answer=JOptionPane.showConfirmDialog(null,getResourceConverter().getFormattedString("String_Node_Str","String_Node_Str",new String[]{schemaFile.getAbsolutePath()}),getResourceConverter().getString("String_Node_Str","String_Node_Str"),JOptionPane.YES_NO_OPTION);
          if (answer == 1) {
            return;
          }
        }
        if (se.isNewFile() && !oldSchemaFile.equals(schemaFile)) {
          oldSchemaFile.delete();
        }
        if (se.isNewFile()) {
          se.setNewFile(false);
        }
        se.setDirty(false);
        se.setDirtyFlag(false);
        XMLOutput out=new XMLOutput(new java.io.FileWriter(jfc.getSelectedFile()));
        schema.displayXML(out);
        se.setSchemaFile(schemaFile);
        se.setTitle();
        setLastUsed(jfc.getSelectedFile().getName(),jfc.getSelectedFile().toURI().toURL().toString());
        JMenuItem sMenuItem=(JMenuItem)schemaWindowMap.get(jf);
        String mtexttokens[]=sMenuItem.getText().split("String_Node_Str");
        sMenuItem.setText(mtexttokens[0] + "String_Node_Str" + se.getSchemaFile().getName());
        updateMDXCatalogList();
      }
 catch (      Exception ex) {
        LOGGER.error(ex);
      }
    }
  }
}