[jira] [Created] (FLINK-4309) Potential null pointer dereference in DelegatingConfiguration#keySet()

[Shang Yuanchun (Jira)]

Ted Yu created FLINK-4309:
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             Summary: Potential null pointer dereference in DelegatingConfiguration#keySet()
                 Key: FLINK-4309
                 URL: https://issues.apache.org/jira/browse/FLINK-4309
             Project: Flink
          Issue Type: Bug
            Reporter: Ted Yu
            Priority: Minor


{code}
    final int prefixLen = this.prefix == null ? 0 : this.prefix.length();

    for (String key : this.backingConfig.keySet()) {
      if (key.startsWith(this.prefix)) {
{code}
If this.prefix == null, we would get NPE in startsWith():
{code}
    public boolean startsWith(String prefix, int toffset) {
        char ta[] = value;
        int to = toffset;
        char pa[] = prefix.value;
{code}



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