java IO Exception Stream Closed

Question

This is the code I currently have   public class FileStatus extends Status  FileWriter writer  public FileStatus        try           writer   new FileWriter  status txt  true         catch  IOException e             e printStackTrace              public void writeToFile        String file text  pedStatusText             gatesStatus             DrawBridgeStatusText      try           writer write file text           writer flush            writer close          catch  IOException e               TODO Auto-generated catch block         e printStackTrace                Everything works as expected  The file is written to when the writeToFile method is called   However when the writeToFile method is called a second time I get the following error       java io IOException  Stream closed     at sun nio cs StreamEncoder ensureOpen StreamEncoder java 45      at sun nio cs StreamEncoder write StreamEncoder java 118      at sun nio cs StreamEncoder write StreamEncoder java 135      at java io OutputStreamWriter write OutputStreamWriter java 220      at java io Writer write Writer java 157      at FileStatus writeToFile FileStatus java 19      at MenuBar 9 actionPerformed MenuBar java 115      at javax swing AbstractButton fireActionPerformed AbstractButton java 2018      at javax swing AbstractButton Handler actionPerformed AbstractButton java 2341      at javax swing DefaultButtonModel fireActionPerformed DefaultButtonModel java 402      at javax swing DefaultButtonModel setPressed DefaultButtonModel java 259      at javax swing AbstractButton doClick AbstractButton java 376      at javax swing plaf basic BasicMenuItemUI doClick BasicMenuItemUI java 833      at javax swing plaf basic BasicMenuItemUI Handler mouseReleased BasicMenuItemUI java 877      at java awt AWTEventMulticaster mouseReleased AWTEventMulticaster java 289      at java awt Component processMouseEvent Component java 6505      at javax swing JComponent processMouseEvent JComponent java 3321      at java awt Component processEvent Component java 6270      at java awt Container processEvent Container java 2229      at java awt Component dispatchEventImpl Component java 4861      at java awt Container dispatchEventImpl Container java 2287      at java awt Component dispatchEvent Component java 4687      at java awt LightweightDispatcher retargetMouseEvent Container java 4832      at java awt LightweightDispatcher processMouseEvent Container java 4492      at java awt LightweightDispatcher dispatchEvent Container java 4422      at java awt Container dispatchEventImpl Container java 2273      at java awt Window dispatchEventImpl Window java 2719      at java awt Component dispatchEvent Component java 4687      at java awt EventQueue dispatchEventImpl EventQueue java 703      at java awt EventQueue access 000 EventQueue java 102      at java awt EventQueue 3 run EventQueue java 662      at java awt EventQueue 3 run EventQueue java 660      at java security AccessController doPrivileged Native Method      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 76      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 87      at java awt EventQueue 4 run EventQueue java 676      at java awt EventQueue 4 run EventQueue java 674      at java security AccessController doPrivileged Native Method      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 76      at java awt EventQueue dispatchEvent EventQueue java 673      at java awt EventDispatchThread pumpOneEventForFilters EventDispatchThread java 244      at java awt EventDispatchThread pumpEventsForFilter EventDispatchThread java 163      at java awt EventDispatchThread pumpEventsForHierarchy EventDispatchThread java 151      at java awt EventDispatchThread pumpEvents EventDispatchThread java 147      at java awt EventDispatchThread pumpEvents EventDispatchThread java 139      at java awt EventDispatchThread run EventDispatchThread java 97  java io IOException  Stream closed     at sun nio cs StreamEncoder ensureOpen StreamEncoder java 45      at sun nio cs StreamEncoder write StreamEncoder java 118      at sun nio cs StreamEncoder write StreamEncoder java 135      at java io OutputStreamWriter write OutputStreamWriter java 220      at java io Writer write Writer java 157      at FileStatus writeToFile FileStatus java 19      at MenuBar 9 actionPerformed MenuBar java 115      at javax swing AbstractButton fireActionPerformed AbstractButton java 2018      at javax swing AbstractButton Handler actionPerformed AbstractButton java 2341      at javax swing DefaultButtonModel fireActionPerformed DefaultButtonModel java 402      at javax swing DefaultButtonModel setPressed DefaultButtonModel java 259      at javax swing AbstractButton doClick AbstractButton java 376      at javax swing plaf basic BasicMenuItemUI doClick BasicMenuItemUI java 833      at javax swing plaf basic BasicMenuItemUI Handler mouseReleased BasicMenuItemUI java 877      at java awt AWTEventMulticaster mouseReleased AWTEventMulticaster java 289      at java awt Component processMouseEvent Component java 6505      at javax swing JComponent processMouseEvent JComponent java 3321      at java awt Component processEvent Component java 6270      at java awt Container processEvent Container java 2229      at java awt Component dispatchEventImpl Component java 4861      at java awt Container dispatchEventImpl Container java 2287      at java awt Component dispatchEvent Component java 4687      at java awt LightweightDispatcher retargetMouseEvent Container java 4832      at java awt LightweightDispatcher processMouseEvent Container java 4492      at java awt LightweightDispatcher dispatchEvent Container java 4422      at java awt Container dispatchEventImpl Container java 2273      at java awt Window dispatchEventImpl Window java 2719      at java awt Component dispatchEvent Component java 4687      at java awt EventQueue dispatchEventImpl EventQueue java 703      at java awt EventQueue access 000 EventQueue java 102      at java awt EventQueue 3 run EventQueue java 662      at java awt EventQueue 3 run EventQueue java 660      at java security AccessController doPrivileged Native Method      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 76      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 87      at java awt EventQueue 4 run EventQueue java 676      at java awt EventQueue 4 run EventQueue java 674      at java security AccessController doPrivileged Native Method      at java security ProtectionDomain 1 doIntersectionPrivilege ProtectionDomain java 76      at java awt EventQueue dispatchEvent EventQueue java 673      at java awt EventDispatchThread pumpOneEventForFilters EventDispatchThread java 244      at java awt EventDispatchThread pumpEventsForFilter EventDispatchThread java 163      at java awt EventDispatchThread pumpEventsForHierarchy EventDispatchThread java 151      at java awt EventDispatchThread pumpEvents EventDispatchThread java 147      at java awt EventDispatchThread pumpEvents EventDispatchThread java 139      at java awt EventDispatchThread run EventDispatchThread java 97  java io IOException  Stream closed     at sun nio cs StreamEncoder ensureOpen StreamEncoder java 45      at sun nio cs StreamEncoder write StreamEncoder java 118      at sun nio cs StreamEncoder write StreamEncoder java 135      at java io OutputStreamWriter write OutputStreamWriter java 220      at java io Writer write Writer java 157      at FileStatus writeToFile FileStatus java 19      at MenuBar 9 actionPerformed MenuBar java 115      at javax swing AbstractButton fireActionPerformed AbstractButton java 2018      at javax swing AbstractButton Handler actionPerformed AbstractButton java 2341      at javax swing DefaultButtonModel fireActionPerformed DefaultButtonModel java 402      at javax swing DefaultButtonModel setPressed DefaultButtonModel java 259      at javax swing AbstractButton doClick AbstractButton java 376      at javax swing plaf basic BasicMenuItemUI doClick BasicMenuItemUI java 833      at javax swing plaf basic BasicMenuItemUI Handler mouseReleased BasicMenuItemUI java 877      at java awt AWTEventMulticaster mouseReleased AWTEventMulticaster java 289      at java awt Component processMouseEvent Component java 6505      at javax swing JComponent processMouseEvent JComponent java 3321      at java awt Component processEvent Component java 6270      at java awt Container processEvent Container java 2229    the file is still written to the second time as expected but it throws this error on the second and future calls to writeToFile    I am wondering what is causing this error to happen

User · Accepted Answer

You re calling writer close    after you ve done writing to it  Once a stream is closed  it can not be written to again  Usually  the way I go about implementing this is by moving the close out of the write to method   public void writeToFile        String file text  pedStatusText             gatesStatus             DrawBridgeStatusText      try           writer write file text           writer flush          catch  IOException e               TODO Auto-generated catch block         e printStackTrace              And add a method cleanUp to close the stream   public void cleanUp          writer close        This means that you have the responsibility to make sure that you re calling cleanUp when you re done writing to the file  Failure to do this will result in memory leaks and resource locking   EDIT  You can create a new stream each time you want to write to the file  by moving writer into the writeToFile   method     public void writeToFile         FileWriter writer   new FileWriter  status txt   true              Write to the file       writer close

User · Answer

You call writer close    in writeToFile so the writer has been closed the second time you call writeToFile   Why don t you merge FileStatus into writeToFile

User · Answer

Don t call write close   in writeToFile

[java] java IO Exception: Stream Closed

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