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User Application hangs frequently when rendering external image



User Application hangs frequently while rendering an external image URL (AWS S3 Bucket) using an Image Icon control.

Error Messages

Thread Dumps in PegaRules log files.

    at java.lang.Object.wait(Native Method)
    at java.awt.MediaTracker.waitForID(
    at javax.swing.ImageIcon.loadImage(
    at javax.swing.ImageIcon.<init>(
    at javax.swing.ImageIcon.<init>(

Steps to Reproduce

  1. Log in to the application > Designer Studio.
  2. Create a section and add an Image Icon control.
  3. Reference this image using an external image URL (Amazon S3 bucket URL).

Root Cause

Issue in Java Swing API when loading external images in which the Thread hangs when the external URL is unavailable or if the connection is slow.


  1. Apply HFix-48358.
  2. Correct the Proxy configuration to use:

    -Dhttps.proxyHost=<proxy host name / ip>
    -Dhttps.proxyPort=port ..
This is performed because the AWS S3 Bucket uses SSL or HTTPS connection.

Published January 20, 2019 - Updated October 8, 2020

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