[MNG-8759] Restore toString method in DefaultJavaToolchain

Author: slawekjaranowski

compat/maven-compat/src/main/java/org/apache/maven/toolchain/ToolchainManagerFactory.java

@@ -212,6 +212,11 @@ public org.apache.maven.api.toolchain.ToolchainModel getModel() {
         public boolean matchesRequirements(Map<String, String> requirements) {
             return delegate.matchesRequirements(requirements);
         }
+
+        @Override
+        public String toString() {
+            return delegate.toString();
+        }
     }
 
     private record ToolchainWrapperV3(org.apache.maven.api.Toolchain delegate) implements Toolchain, ToolchainPrivate {
@@ -235,5 +240,10 @@ public boolean matchesRequirements(Map<String, String> requirements) {
         public ToolchainModel getModel() {
             return new ToolchainModel(delegate.getModel());
         }
+
+        @Override
+        public String toString() {
+            return delegate.toString();
+        }
     }
 }

impl/maven-impl/src/main/java/org/apache/maven/impl/DefaultJavaToolchainFactory.java

@@ -167,6 +167,11 @@ public boolean matchesRequirements(Map<String, String> requirements) {
             }
             return true;
         }
+
+        @Override
+        public String toString() {
+            return "JDK[" + getJavaHome() + "]";
+        }
     }
 
     static final class ExactMatcher implements Predicate<String> {