Are you sure you're looking at the same exception?

The first is "com.image.exception.ConversionException", while the one of the shorter trace is reported as "java.lang.NullPointerException".  Just wondering...

Update: also, the line numbers differ for

java.lang.NullPointerException
        at com.image.RemImag.idxDoc(RemImag.java:81)
        ...                                      ^^
[download]

vs. the corresponding line in the other trace

com.image.exception.ConversionException: ...
        ...
        at com.image.RemImag.idxDoc(RemImag.java:77)
        ...                                      ^^
[download]

IOW, the difference doens't seem to be merely a few lines being cut off...