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via Coderanch by adeeb alexander, 1 year ago
Component must be non-null
via Oracle Community by 843806, 7 months ago
Component must be non-null
via Coderanch by Ted Newholm, 1 year ago
Component must be non-null
via Stack Overflow by maximus
, 2 years 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$ComponentSpring.(GroupLayout.java:2878)	at javax.swing.GroupLayout$ComponentSpring.(GroupLayout.java:2858)	at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1490)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2414)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2384)	at javax.swing.GroupLayout$Group.addComponent(GroupLayout.java:1471)	at javax.swing.GroupLayout$ParallelGroup.addComponent(GroupLayout.java:2406)	at library.(library.java:269)	at library.main(library.java:515)