4GL to J2EE Conversion Tools?

FunkyGibbin' asks: "I've just started with a new company that has outsourced a project to translate a 4GL language - some 1.5 million lines of it - into J2EE. It's way behind schedule, and keeps on tripping over itself at acceptance test points (one item is fixed, others are broken). The outsourcing company chose as their conversion tool IBM's Rexx. They don't parse the 4GL to a syntax tree and then generate from that. They 'match patterns' which then generates the output. In addition, they're not even using the object oriented features of Rexx; it's in procedural Rexx! They have no regression test suite that runs through the original system and the newly generated system to ensure that they produce the same result [this apparently was 'our job' to do it manually]. Frankly, I consider the outsourcing company to have adopted completely the wrong approach, but I'm happy to be proven wrong if compiler construction or language translation experts can tell me that Rexx was their best choice, or even a reasonable choice! Any and all information gratefully accepted - this project has so far cost many dollars, and the board is unsure what to do with it."