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POWhich @NotNull Java annotation should I use?
 

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  1. POWhich @NotNull Java annotation should I use?
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    <p>I'm looking to make my code more readable as well as use tooling like IDE code inspection and/or static code analysis (FindBugs and Sonar) to avoid NullPointerExceptions. Many of the tools seem incompatible with each others' <code>@NotNull</code>/<code>@NonNull</code>/<code>@Nonnull</code> annotation and listing all of them in my code would be terrible to read. Any suggestions of which one is the 'best'? Here is the list of equivalent annotations I've found:</p> <ul> <li><p><strong><code>javax.validation.constraints.NotNull</code></strong><br> <em>Created for runtime validation, not static analysis.</em><br> <a href="http://download.oracle.com/javaee/6/api/javax/validation/constraints/NotNull.html" rel="noreferrer">documentation</a></p></li> <li><p><strong><code>edu.umd.cs.findbugs.annotations.NonNull</code></strong><br> <em>Used by <a href="http://findbugs.sourceforge.net/" rel="noreferrer">Findbugs</a> static analysis and therefore Sonar (now <a href="https://www.sonarqube.org/" rel="noreferrer">Sonarqube</a>)</em><br> <a href="http://findbugs.sourceforge.net/manual/annotations.html" rel="noreferrer">documentation</a></p></li> <li><p><strong><code>javax.annotation.Nonnull</code></strong><br> <em>This might work with Findbugs too, but <a href="https://jcp.org/en/jsr/detail?id=305" rel="noreferrer">JSR-305</a> is inactive. (See also: <a href="https://stackoverflow.com/questions/2289694/what-is-the-status-of-jsr-305">What is the status of JSR 305?</a>)</em> <a href="http://code.google.com/p/jsr-305/source/browse/trunk/ri/src/main/java/javax/annotation/Nonnull.java" rel="noreferrer">source</a></p></li> <li><p><strong><code>org.jetbrains.annotations.NotNull</code></strong><br> <em>Used by IntelliJ IDEA IDE for static analysis.</em><br> <a href="https://www.jetbrains.com/help/idea/nullable-and-notnull-annotations.html" rel="noreferrer">documentation</a></p></li> <li><p><strong><code>lombok.NonNull</code></strong><br> <em>Used to control code generation in <a href="https://projectlombok.org/" rel="noreferrer">Project Lombok</a>.</em><br> <em>Placeholder annotation since there is no standard.</em><br> <a href="https://github.com/rzwitserloot/lombok/blob/master/src/core/lombok/NonNull.java" rel="noreferrer">source</a>, <a href="https://projectlombok.org/features/NonNull.html" rel="noreferrer">documentation</a></p></li> <li><p><strong><code>android.support.annotation.NonNull</code></strong><br> <em>Marker annotation available in Android, provided by support-annotations package</em><br> <a href="https://developer.android.com/reference/android/support/annotation/NonNull.html" rel="noreferrer">documentation</a></p></li> <li><p><strong><code>org.eclipse.jdt.annotation.NonNull</code></strong><br> <em>Used by Eclipse for static code analysis</em><br> <a href="http://help.eclipse.org/oxygen/topic/org.eclipse.jdt.doc.user/tasks/task-improve_code_quality.htm" rel="noreferrer">documentation</a></p></li> </ul>
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    1. USDavid Tonhofer
    1. USjaxzin
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    1. COapache should invent a "common" annotation and a tool that can convert it to any other annotation. the solution to the problem of too many standards is to invent a new standard.
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      1. USirreputable
    2. CO@NotNull within idea also does runtime checking (At least in v10.5)
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    3. CO@irreputable if apache invents a new "common", there would be 56 versions of it, overlapping with other projects. And, it wouldn't be standard anyway (standard != widespread). Better use anything really standard, javax?.* . BTW, there aren't "too many standards" in those examples, I just see 1 or 2.
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