Just adding to the others suggested here, but Raygun ( http://raygun.io ) has first class support for Java.
More details here: http://raygun.io/java
I work in Mindscape, which Raygun created, so I can answer any of your questions: jd@mindscape.co.nz. We already have a large number of organizations using Raygun with their Java applications, although Raygun supports other platforms (.NET, Node, Rails, PHP etc.)
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