Program: 167406
Project: 167406
Buggy source:
public ManageProjectsPanel(ApplicationContext context,DesignNavigator projectNavigator){
  this.setSizeFull();
  this.context=context;
  this.projectNavigator=projectNavigator;
  ButtonBar buttonBar=new ButtonBar();
  addComponent(buttonBar);
  openProjectButton=buttonBar.addButton("String_Node_Str",Icons.PROJECT);
  openProjectButton.addClickListener(event -> openProject(treeTable.getValue()));
  newProjectButton=buttonBar.addButton("String_Node_Str",Icons.PROJECT);
  newProjectButton.addClickListener(event -> createNewProject());
  newVersionButton=buttonBar.addButton("String_Node_Str",Icons.VERSION);
  newVersionButton.addClickListener(event -> createNewVersion());
  newVersionButton.setEnabled(false);
  newVersionButton.setDescription("String_Node_Str");
  editButton=buttonBar.addButton("String_Node_Str",FontAwesome.EDIT);
  editButton.addClickListener(event -> edit(treeTable.getValue()));
  removeButton=buttonBar.addButton("String_Node_Str",Icons.DELETE);
  removeButton.addClickListener(event -> removeProject());
  enterKeyListener=new ShortcutListener("String_Node_Str",KeyCode.ENTER,null){
    public void handleAction(    Object sender,    Object target){
      if (currentlyEditing != null) {
        save();
      }
 else {
        openProject(treeTable.getValue());
      }
    }
  }
;
  treeTable=new TreeTable();
  treeTable.setSizeFull();
  treeTable.setSortEnabled(true);
  treeTable.setCacheRate(100);
  treeTable.setImmediate(true);
  treeTable.setSelectable(true);
  treeTable.setEditable(true);
  treeTable.addContainerProperty("String_Node_Str",String.class,"String_Node_Str","String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",String.class,"String_Node_Str","String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",Boolean.class,null,"String_Node_Str",null,null);
  treeTable.setColumnWidth("String_Node_Str",45);
  treeTable.addContainerProperty("String_Node_Str",Boolean.class,null,"String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",Date.class,null,"String_Node_Str",null,null);
  treeTable.setColumnCollapsingAllowed(true);
  treeTable.setColumnCollapsed("String_Node_Str",true);
  treeTable.addItemClickListener(new TreeTableItemClickListener());
  treeTable.addValueChangeListener(event -> save());
  treeTable.setTableFieldFactory(new FieldFactory());
  treeTable.setSortContainerPropertyId("String_Node_Str");
  treeTable.setSortAscending(true);
  addComponent(treeTable);
  setExpandRatio(treeTable,1);
  refresh();
}

Fixed version (ground truth):
public ManageProjectsPanel(ApplicationContext context,DesignNavigator projectNavigator){
  this.setSizeFull();
  this.context=context;
  this.projectNavigator=projectNavigator;
  ButtonBar buttonBar=new ButtonBar();
  addComponent(buttonBar);
  openProjectButton=buttonBar.addButton("String_Node_Str",Icons.PROJECT);
  openProjectButton.addClickListener(event -> openProject(treeTable.getValue()));
  newProjectButton=buttonBar.addButton("String_Node_Str",Icons.PROJECT);
  newProjectButton.addClickListener(event -> createNewProject());
  newVersionButton=buttonBar.addButton("String_Node_Str",Icons.VERSION);
  newVersionButton.addClickListener(event -> createNewVersion());
  newVersionButton.setEnabled(false);
  newVersionButton.setDescription("String_Node_Str");
  editButton=buttonBar.addButton("String_Node_Str",FontAwesome.EDIT);
  editButton.addClickListener(event -> edit(treeTable.getValue()));
  removeButton=buttonBar.addButton("String_Node_Str",Icons.DELETE);
  removeButton.addClickListener(event -> removeProject());
  treeTable=new TreeTable();
  treeTable.setSizeFull();
  treeTable.setSortEnabled(true);
  treeTable.setCacheRate(100);
  treeTable.setImmediate(true);
  treeTable.setSelectable(true);
  treeTable.setEditable(true);
  treeTable.addContainerProperty("String_Node_Str",String.class,"String_Node_Str","String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",String.class,"String_Node_Str","String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",Boolean.class,null,"String_Node_Str",null,null);
  treeTable.setColumnWidth("String_Node_Str",45);
  treeTable.addContainerProperty("String_Node_Str",Boolean.class,null,"String_Node_Str",null,null);
  treeTable.addContainerProperty("String_Node_Str",Date.class,null,"String_Node_Str",null,null);
  treeTable.setColumnCollapsingAllowed(true);
  treeTable.setColumnCollapsed("String_Node_Str",true);
  treeTable.addItemClickListener(new TreeTableItemClickListener());
  treeTable.addValueChangeListener(event -> save());
  treeTable.setTableFieldFactory(new FieldFactory());
  treeTable.setSortContainerPropertyId("String_Node_Str");
  treeTable.setSortAscending(true);
  addComponent(treeTable);
  setExpandRatio(treeTable,1);
  refresh();
}