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<span style="color: #222222">However, if you still can't get  the image displayed correctly after a long time and even after you have  refreshed your browser, you probably have a "</span>java.lang.OutOfMemoryError:  Java heap space"&nbsp;exception  in the backend. This is due to the image  being too large, thus, requiring more  memory to process the image  preview. In that case, you may need to increase your Tomcat memory  setting by following the steps below (which will double the default  memory setting).
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1. Stop JogetWF.
2. Open and edit \[SANDBOX:Joget Installation Directory\]/joget-start.bat.
3. Modify&nbsp;<span style="color: #484848">set JAVA_OPTS=</span><span style="color: #484848"><strong>&#45;XX:MaxPermSize=128m</strong></span> <span style="color: #484848"><strong>&#45;Xmx512M</strong></span> <span style="color: #484848">&#45;Dwflow.home=./wflow/</span>&nbsp;on line 13 to&nbsp;&nbsp;<span style="color: #484848">set JAVA_OPTS=</span><span style="color: #484848"><strong>&#45;XX:MaxPermSize=256m</strong></span> <span style="color: #484848"><strong>&#45;Xmx1024M</strong></span> <span style="color: #484848">&#45;Dwflow.home=./wflow/.</span>
4. Save and start JogetWF.

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Note: If you get a "black" preview image instead of the process  preview image, you will need to delete the generated images located  in&nbsp;\[SANDBOX:Joget Installation Directory\]/wflow/app_xpdlImages/\[SANDBOX:App Id\] and  refresh your browser. A new image will be generated again.

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  1. Stop Joget.
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    Delete "jw" folder, "jwdesigner" folder, "jw.war" &  "jwdesigner.war" in your "\[SANDBOX:Joget Installation  Directory\]/apache-tomcat-6.0.18/webapps".
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    Delete "jw" folder, "jwdesigner" folder in your "\[SANDBOX:Joget Installation Directory\]/apache-tomcat-6.0.18/work/Catalina/localhost".
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    Place the downloaded "jw.war" & "jwdesigner.war" in "\[SANDBOX:Joget Installation Directory\]/apache-tomcat-6.0.18/webapps".
  5. Start Joget.

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