I am trying to use aspectJ to do AOP programming. But AJC compiler throw errors below, javac compiler works perfectly.
Error:(19, 0) ajc: The method getKey() is undefined for the type Object
Error:(19, 0) ajc: The method getValue() is undefined for the type Object
Error:(22, 0) ajc: Cannot refer to the static enum field ApplicationType.transport within an initializer
Error:(25, 0) ajc: Cannot refer to the static enum field ApplicationType.exposure within an initializer
Error:(28, 0) ajc: Cannot refer to the static enum field ApplicationType.manufacture within an initializer
Error:(31, 0) ajc: Cannot refer to the static enum field ApplicationType.factoryhub within an initializer
My source file is Maps.java ApplicationType.java --
public class Maps {
public static <K, V> Map<K, V> toMap(Map.Entry<K, V>... entries) {
return Collections.unmodifiableMap(
Stream
.of(entries)
// compile error The method getKey() is undefined for the type Object
.collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue())));
}
}
ApplicationType.java
public enum ApplicationType {
transport(0),
exposure(1),
manufacture(2),
factoryhub(3);
private int code;
ApplicationType(int code) {
this.code = code;
}
ApplicationType(String application) {
for (ApplicationType value : values()) {
if (value.name().equals(application)) {
switch (value) {
//ajc: Cannot refer to the static enum field ApplicationType.transport within an initializer
case transport:
setCode(0);
break;
case exposure:
setCode(1);
break;
case manufacture:
setCode(2);
break;
case factoryhub:
setCode(3);
break;
default:
break;
}
}
}
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
}
Fix for
Reason for above errors is aspectj unable to discover the type of
.toMap
result. Lambda expressions are evaluated lazily whenever a collect operation is performed. To fix the error, see the variation of the code below. Store the results of.toMap
operation explicitly and then userCollections.unmodifiableMap
Fix for:
Overloaded constructor
Application(String name)
for enum looks incorrect. You can simplify your enum code as shown below to get rid of error.I have added a
parse
method in case you want the enum back based onname
.Hope this helps.