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  1. ,

    You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

  2. ,

    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via Coderanch by David Brossard, 1 year ago
For input string: "bla"
via GitHub by spoenemann
, 9 months ago
For input string: " 1"
java.lang.NumberFormatException: For input string: "    "	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)	at java.lang.Integer.parseInt(Integer.java:447)	at java.lang.Integer.parseInt(Integer.java:497)	at hrms.MDI.jButton3ActionPerformed(MDI.java:412)	at hrms.MDI.access$000(MDI.java:28)	at hrms.MDI$2.actionPerformed(MDI.java:258)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.plaf.basic.BasicButtonListener$Actions.actionPerformed(BasicButtonListener.java:287)	at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1571)	at javax.swing.JComponent.processKeyBinding(JComponent.java:2763)	at javax.swing.JComponent.processKeyBindings(JComponent.java:2798)	at javax.swing.JComponent.processKeyEvent(JComponent.java:2726)	at java.awt.Component.processEvent(Component.java:5265)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3955)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1810)	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:672)	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:920)	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:798)	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:636)	at java.awt.Component.dispatchEventImpl(Component.java:3841)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Window.dispatchEventImpl(Window.java:1778)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)