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Editorial Team
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Asked: 2026-05-14T19:19:14+00:00

I want my findbugs report not show the following error: DM_NUMBER_CTOR: Method invokes inefficient

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I want my findbugs report not show the following error:

DM_NUMBER_CTOR: Method invokes inefficient Number constructor; use static valueOf instead

The problem is that this happens in groovy-generated code files, so I can’t control the source code – that is why I want to exclude it and add it to my exclude filter.

I do not want to add explicitly class (since I make API that many tools will use, I want my filter to be generic). I would not like to completely remove this bug from the report by type, I would really like to only exclude this bug from appearing if it happenned in “static initializer” methods. Any idea? I tried the filter below but no luck, maybe somebody has better idea?

<Match>
    <Method name="~.*static initializer.*" />
    <Bug pattern="DM_NUMBER_CTOR" />
</Match>

Here is the “stacktrace” of FindBugs in that case:

In class net.milanaleksic.cuc.tools.sound.SoundPlayerTool
In method net.milanaleksic.cuc.tools.sound.SoundPlayerTool.()
Called method new Long(long)
Should call Long.valueOf(long) instead
In SoundPlayerTool.groovy

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1 Answer

  1. Editorial Team

    I would guess the static initializer code would be reported as taking place in method called <clinit>. Could you try setting a <Method name='&lt;clinit&gt;'/> filter? (which is pretty much <clinit> but XML-escaped). Totally untested, just some random thoughts.

    My clue was this part of http://findbugs\.googlecode\.com&sa=N&cd=2&ct=rc&l=125″>some FindBugs internal tests:

     String methodName = m.getMethodName();
 ...
 if (...  methodName.equals("<clinit>")) ) ...

    I am not sure but I think the same method name (<clinit>) is mentioned if the bugs actually happen…

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