Eirik Bakke created NETBEANS-407:
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Summary: "Dereferencing possible null pointer" after doing
instanceof on variable (false positive)
Key: NETBEANS-407
URL: https://issues.apache.org/jira/browse/NETBEANS-407
Project: NetBeans
Issue Type: Bug
Components: java - FindBugs, java - Hints
Affects Versions: 8.2, 9.0
Reporter: Eirik Bakke
In the following example, the "boolean foo = k instanceof Integer" assignment
causes a spurious "Dereferencing possible null pointer" warning to occur on the
"k.doubleValue()" expression. I believe this did not happen in earlier NetBeans
versions (pre-8.2). Note that if the assignment to "boolean foo" is replaced by
an if statement ("if (k instanceof Integer)"), the warning goes away.
{code:java}
public class TestClass {
private Number getFoo() {
return 3;
}
public void testFoo() {
Number k = getFoo();
// The warning only occurs if this assignment is present.
boolean foo = k instanceof Integer;
// Warning on .doubleValue() here: "Dereferencing possible null pointer"
System.out.println(k.doubleValue());
}
}
{code}
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