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Prevent APT crashes on older Java versions 

Update TypeUtils to guard against the use of older Java versions.
Both `Collection` and `Map` type lookups now fallback to generic free
versions of the classes.

Prior to this commit using `xmlbeans-maven-plugin` in combination with
Spring Boot's annotation processor could result in
`IllegalArgumentException: Incorrect number of type arguments`.

Fixes gh-6122
This commit is contained in:
Phillip Webb 2016-06-10 17:06:45 -07:00
parent a9b98cada5
commit f27bdcb737
1 changed files with 19 additions and 7 deletions
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26
spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java
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@ -27,7 +27,6 @@ import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.WildcardType;
import javax.lang.model.util.Types;
/**
@ -73,12 +72,25 @@ class TypeUtils {
TypeUtils(ProcessingEnvironment env) {
this.env = env;
Types types = env.getTypeUtils();
WildcardType wc = types.getWildcardType(null, null);
this.collectionType = types.getDeclaredType(
this.env.getElementUtils().getTypeElement(Collection.class.getName()),
wc);
this.mapType = types.getDeclaredType(
this.env.getElementUtils().getTypeElement(Map.class.getName()), wc, wc);
this.collectionType = getDeclaredType(types, Collection.class, 1);
this.mapType = getDeclaredType(types, Map.class, 2);
}
private TypeMirror getDeclaredType(Types types, Class<?> typeClass,
int numberOfTypeArgs) {
TypeMirror[] typeArgs = new TypeMirror[numberOfTypeArgs];
for (int i = 0; i < typeArgs.length; i++) {
typeArgs[i] = types.getWildcardType(null, null);
}
TypeElement typeElement = this.env.getElementUtils()
.getTypeElement(typeClass.getName());
try {
return types.getDeclaredType(typeElement, typeArgs);
}
catch (IllegalArgumentException ex) {
// Try again without generics for older Java versions
return types.getDeclaredType(typeElement);
}
}
public String getType(Element element) {