EnumMap's not supported in type conversion + InstantiationException
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Key: WW-2513
URL: https://issues.apache.org/struts/browse/WW-2513
Project: Struts 2
Issue Type: Bug
Components: Plugin - Tags
Affects Versions: 2.0.11
Environment: Windows 2000 SP4
WebLogic Server 9.2 M1
JVM 5.0 (build 1.5.0_06-b05) - bundled with WLS installation
Reporter: Maxx
Unlike regular classes implementing interface java.util.Map, EnumMap are not
well supported through the (automatic?) "Type Conversion" as described here:
http://struts.apache.org/2.x/docs/type-conversion.html
1/ the values can't be retrieved through the use of some map-like OGNL
expressions like %{myEnumMap['myEnumValue']}
Neither by just removing the single quotes i.e. %{myEnumMap[myEnumValue]} or by
using the @...@ notation e.g. [EMAIL PROTECTED]@MyEnum.myEnumValue]} it still
doesn't work.
In the example below, the corresponding <s:textfield /> are not populated,
while the ones for the Map are.
2/ when setting values back to the object, an InstantiationException occurs.
Effectively, an EnumMap has NO no-arg constructor because initializing an Enum
needs to set a parameter: the enum type.
Note: IMHO looking for a declared no-arg constructor is wrong as Java
automatically declares a public no-arg constructor, but here it's not exactly
the problem (I'll come back later to this with another issue).
See attached files for a full running example:
- TestAction.java:
* 1 Map & 1 EnumMap are initialized with 2 entries (key+value) both
* the execute() method does the initialization, while the executeLog() does
the logging.
- TestAction-conversion.properties: the appropriate type conversion properties
file
- TestEnum.java: the Enum used as key universe for the EnumMap
- test.jsp: contains too iterators over the Map & the EnumMap
- struts.xml (but it's succinct)
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