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via Coderanch by Ted Newholm, 1 year ago
Component must be non-null
via Oracle Community by 843806, 5 months ago
Component must be non-null
via Coderanch by adeeb alexander, 1 year ago
Component must be non-null
via Stack Overflow by maximus
, 1 year ago
Component must be non-null
via GitHub by winduptoy
, 2 years ago
java.lang.IllegalArgumentException: Component must be
 non-null	at javax.swing.GroupLayout$ComponentSpring.(GroupLayout.java:2953)	at javax.swing.GroupLayout$ComponentSpring.(GroupLayout.java:2933)	at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1524)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2484)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2454)	at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1505)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2476)	at undefined.GroupedLayout2x2.(GroupedLayout2x2.java:32)	at undefined.GroupedLayout2x2.main(GroupedLayout2x2.java:61)