java.lang.NullPointerException at
org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:2168)
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Key: BEANUTILS-367
URL: https://issues.apache.org/jira/browse/BEANUTILS-367
Project: Commons BeanUtils
Issue Type: Bug
Components: Bean / Property Utils
Affects Versions: 1.8.0
Environment: 1.6 JDK
Reporter: Lee Cooper
Priority: Minor
the reason this is thrown is because an IllegalArgumentException is thrown and
then no one is checking the class to construct an error message anyway long
story short I fixed it and here is how I did it....
private Object invokeMethod(
Method method,
Object bean,
Object[] values)
throws
IllegalAccessException,
InvocationTargetException {
try {
return method.invoke(bean, values);
} catch (IllegalArgumentException cause)
{
if(bean == null) {
throw new IllegalArgumentException("No bean specified " +
"- this should have been checked before reaching this
method");
}
String valueString = "";
if (values != null) {
for (int i = 0; i < values.length; i++) {
if (i>0) {
valueString += ", " ;
}
//
if(values[i] != null)
{
valueString += (values[i]).getClass().getName();
}
else
{
valueString += "Null Object Class Identity Not Known";
}
}
}
String expectedString = "";
Class[] parTypes = method.getParameterTypes();
if (parTypes != null) {
for (int i = 0; i < parTypes.length; i++) {
if (i > 0) {
expectedString += ", ";
}
expectedString += parTypes[i].getName();
}
}
IllegalArgumentException e = new IllegalArgumentException(
"Cannot invoke " + method.getDeclaringClass().getName() + "."
+ method.getName() + " on bean class '" + bean.getClass() +
"' - " + cause.getMessage()
// as per https://issues.apache.org/jira/browse/BEANUTILS-224
+ " - had objects of type \"" + valueString
+ "\" but expected signature \""
+ expectedString + "\""
);
if (!BeanUtils.initCause(e, cause)) {
log.error("Method invocation failed", cause);
}
throw e;
}
}
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