Memory Leaks when report contains hidden table

apratimk

<p><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">Hi , </span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">We are using birt runtime 4.4.1 jar.</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">We have observed that whenever there is hidden table in birt report and report is producing large data data it throws OutOfMemoryException.</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">Further profiling shows that HTMLAbstractLM had method named handleVisibility() which has following code</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">if ( LayoutUtil.isHidden( content, emitter.getOutputFormat( ), context</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">.getOutputDisplayNone( ), hiddenMask ) )</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">{</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">isVisible = false;</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">boolean allowPageBreak = context.allowPageBreak( );</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">context.setAllowPageBreak( false );</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">traverse( executor, content );</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">context.setAllowPageBreak( allowPageBreak );</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">return true;</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">}</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">This traverse method is putting lots of children in memory and this is the cause for OutOfMemoryException.</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">Not sure why call to method traverse() is needed here if we are not displaying elements on reports.</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">When I commented out this method there is no Memory Leak and other things seemed to work. But I don't know what could be the impact of this.</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">Comments in the code just says</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">// For fixed layout reports and in run task, we need to emit the</span><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">// invisible content to PDF layout engine.</span><br><br><span style="color:rgb(0,0,0);font-family:'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;background-color:rgb(244,244,244);">If anyone has idea it would be really helpful</span></p>