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From pier...@apache.org
Subject cvs commit: jakarta-taglibs/standard/src/org/apache/taglibs/standard/tag/common/sql QueryTagSupport.java
Date Thu, 17 Feb 2005 00:41:37 GMT
pierred     2005/02/16 16:41:37

  Modified:    standard/src/org/apache/taglibs/standard/tag/common/sql
                        QueryTagSupport.java
  Log:
  Patch from Dhiru Pandey for bug #17388
  
  This is needed because in the current implementation, if an error occurs
  before the preparedStatement is closed, then the closing of the
  preparedStatement would depend on the implementation of finalize() for
  the PreparedStatement class which should be called when that object is
  GCed (Garbage Collected). This is not a good practice since:
  
  a) we should not depend on the implementation of the finalize() method
       in PreparedStatement
  b) the invocation of the finalize() method is not guaranteed by the JVM.
       So even if finalize() does call close(), there is no guarantee
       that finalize() itself will be called when this object is GCed
       and we may continue to see memory leaks and resource leaks
       as reported in Bug 17388 (Result set created in query tag is never
       released + update tag)
  
  Revision  Changes    Path
  1.40      +10 -2     jakarta-taglibs/standard/src/org/apache/taglibs/standard/tag/common/sql/QueryTagSupport.java
  
  Index: QueryTagSupport.java
  ===================================================================
  RCS file: /home/cvs/jakarta-taglibs/standard/src/org/apache/taglibs/standard/tag/common/sql/QueryTagSupport.java,v
  retrieving revision 1.39
  retrieving revision 1.40
  diff -u -r1.39 -r1.40
  --- QueryTagSupport.java	28 Feb 2004 01:01:45 -0000	1.39
  +++ QueryTagSupport.java	17 Feb 2005 00:41:36 -0000	1.40
  @@ -209,15 +209,23 @@
   	 * value for isLimitedByMaxRows(); there's no way to check
   	 * if it was from the ResultSet.
             */
  +	PreparedStatement ps = null;
   	try {
  -	    PreparedStatement ps = conn.prepareStatement(sqlStatement);
  +	    ps = conn.prepareStatement(sqlStatement);
   	    setParameters(ps, parameters);
   	    ResultSet rs = ps.executeQuery();
   	    result = new ResultImpl(rs, startRow, maxRows);
  -            ps.close();
   	}
   	catch (Throwable e) {
   	    throw new JspException(sqlStatement + ": " + e.getMessage(), e);
  +	} finally {
  +	    if (ps != null) {
  +		try {
  +		    ps.close();
  +		} catch (SQLException sqe) {
  +		    throw new JspException(sqe.getMessage(), sqe);
  +		}
  +	    }
   	}
   	pageContext.setAttribute(var, result, scope);
   	return EVAL_PAGE;
  
  
  

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