Getting java.lang.ClassCastException when using "DefaultTableCellRenderer"

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Mohomedmifraz
Created

Hi, 
I am using DefaultTableCellRenderer to cast my JTable cells and I get java.lang.ClassCastException. My plugin works fine on all the versions before 2019.2 . I get this error only in IntelliJ IDEA Community 2019.2. Please find the code and the error from below. 
```((DefaultTableCellRenderer) scanResultsTable.getTableHeader().getDefaultRenderer()) 
.setHorizontalAlignment(SwingConstants.LEADING);```

Error: 
```java.lang.ClassCastException: com.intellij.ui.table.JBTable$JBTableHeader$2 cannot be cast to javax.swing.table.DefaultTableCellRenderer```

Can someone please help me figure out what cause this issue since it is only occurs in IntelliJ Community 2019.2 .

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Mikhail Sokolov
Created

Hi!
Could you explain what is your plugin supposed to do?
At first sight it looks like you are trying to fix the header alignment for left-to-right languages, aren't you? In this case I suppose we'd better fix it in platform.

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Aleksey Pivovarov
Created

Default renderer for JBTable headers was changed (and no longer can be cast to the `DefaultTableCellRenderer` or `JComponent`).

You can update your code like this (it should work with all IDE versions):

      TableCellRenderer renderer = table.getTableHeader().getDefaultRenderer();
      TableCellRenderer newRenderer = new TableCellRenderer() {
        @Override
        public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
          Component delegate = renderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
          if (delegate instanceof JLabel) {
            ((JLabel)delegate).setHorizontalAlignment(SwingConstants.LEADING);
          }
          return delegate;
        }
      };
      table.getTableHeader().setDefaultRenderer(newRenderer);
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Mohomedmifraz
Created

Hi @Aleksey Pivovarov: Thanks for the reply. I will try this out.

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