get.sh failed to detect TEST_JDK_HOME with JRE build

While testing JCK with Semeru JRE build, get.sh script failed to detect TEST_JDK_HOME.

**Error:**
_ENCODE_FILE_NEW=UNTAGGED curl -OLJSks --user ****:**** https://na.artifactory.swg-devops.com/artifactory/sys-rt-generic-local/UploadFile/467/custom_jre.tar.gz
12:52:16 Uncompressing file: custom_jre.tar.gz ...
12:52:17 /home/jenkins/workspace/Grinder_CR/jdkbinary/j2sdk-image/bin/java does not exist! Searching under TEST_JDK_HOME: /home/jenkins/workspace/Grinder_CR/jdkbinary/j2sdk-image...
12:52:17 find: '/home/jenkins/workspace/Grinder_CR/jdkbinary/j2sdk-image': No such file or directory

**Test Job** : hyc-jenkins/Grinder_CR/14780/

**Custom JRE build** : hyc-jenkins/Test_grinder/UploadFile/467/

Start with get.sh and the hyc-jenkins/Grinder_CR/14780 test job, using the custom JRE build from Test_grinder/UploadFile/467 to reproduce the failure. Trace how TEST_JDK_HOME is detected and verify that the script locates the JRE's java executable without searching for the missing j2sdk-image path.

Written by the indexing model from the issue text.