This occurs as the search indexer included with SFEE 4.4, requires the 4.3 java SDK. You can obtain the java 4.3 SDK at the link below. Extract the file to /usr/local/sourceforge/sourceforge_home/sfsoap (assuming you installed SourceForge into /usr/local/sourceforge).
Running the SearchReindex.sh script on a clean SFEE 4.4 install sometimes fails with the following message: Soap43 SDK must exist: /usr/local/sourceforge/sourceforge_home/sfsoap/sf_43_sdk/soap/lib.
After installing the 4.3 SDK, you may receive the following error:
Could not login (; nested exception is: java.lang.NullPointerException)
This is due to an older version of axis.jar being included in the 43 SDK. You can correct this by copying a newer version of axis.jar into the sf_43_sdk directory:
cp /usr/local/sourceforge/sourceforge_home/lib/axis.jar /usr/local/sourceforge/sourceforge_home/sfsoap/sf_43_sdk/soap/lib/
You may need to substitute /usr/local/sourceforge for the location of your SourceForge install.