java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

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    java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
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    NullPointerException on Matcher.appendEvaluated()?

    Stack Overflow | 4 years ago | Anthony Gonzalez
    java.lang.NullPointerException

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference

      at java.util.regex.Matcher.appendEvaluated()
    2. Java RT
      String.replaceAll
      1. java.util.regex.Matcher.appendEvaluated(Matcher.java:131)
      2. java.util.regex.Matcher.appendReplacement(Matcher.java:111)
      3. java.util.regex.Matcher.replaceAll(Matcher.java:319)
      4. java.lang.String.replaceAll(String.java:1353)
      4 frames