NullPointerException in SchemaType.getEnumJavaClass
---------------------------------------------------
Key: XMLBEANS-478
URL: https://issues.apache.org/jira/browse/XMLBEANS-478
Project: XMLBeans
Issue Type: Bug
Components: XmlObject, XPath
Affects Versions: Version 2
Reporter: Martin McCallion
Priority: Minor
I have code like this, where currentElement is an XmlObject:
// Check whether we're dealing with an enumeration.
Class fieldClass;
SchemaType t = currentElement.schemaType();
if (t.getEnumJavaClass() != null) // According the JavaDoc, should
return null if it's not an enum.
{
fieldClass = currentElement.schemaType().getEnumJavaClass();
}
else
{
fieldClass = currentElement.getClass();
}
This throws a NullPointerException as follows:
[27/01/12 14:02:27:526 GMT] 00000030 SystemOut O E Exception caught within
struts
java.lang.NullPointerException
at
org.apache.xmlbeans.impl.schema.SchemaTypeImpl.getEnumJavaClass(SchemaTypeImpl.java:1835)
at
com.misys.meridian.runtime.message.XmlMessageImpl.setFieldValue(XmlMessageImpl.java:711)
at
com.misys.meridian.runtime.message.XmlMessageImpl.setField(XmlMessageImpl.java:950)
at
com.misys.meridian.runtime.message.XmlMessageImpl.setField(XmlMessageImpl.java:989)
...
I found source for SchemaTypeImpl here:
http://www.docjar.com/html/api/org/apache/xmlbeans/impl/schema/SchemaTypeImpl.java.html.
The method in question looks like this (line numbers provided at that link):
1829 public Class getEnumJavaClass()
1830 {
1831 // This field is declared volatile and Class is immutable so
this is allowed.
1832 if (_javaEnumClass == null)
1833 {
1834 try
1835 { _javaEnumClass =
Class.forName(getBaseEnumType().getFullJavaName() + "$Enum", false,
getTypeSystem().getClassLoader()); }
1836 catch (ClassNotFoundException e)
1837 { _javaEnumClass = null; }
1838 }
1839
1840 return _javaEnumClass;
1841 }
Line 1835 could NPE if getBaseEnumType() returns null. And indeed, elsewhere
in the same class we see:
1465 public SchemaType getBaseEnumType()
1466 {
1467 return _baseEnumTyperef == null ? null : _baseEnumTyperef.get();
1468 }
Which suggests that that is exactly what's happening.
It is, of course, possible that I have done something wrong in creating my
generated classes, such that they are missing some necessary data. But if that
is so, there ought to be a more informative Exception. And note that the
classes were generated using scomp from an ISO20022 schema.
I'm working around this by checking for a null return on getEnumerationValues()
instead.
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