Enable using SimpleFlatMapper as companion for JOOQ mapping (#218)

* Enable using SimpleFlatMapper as companion for JOOQ mapping in GraalVM native build

* Fixed code style

* Make GraalVM substitution conditional based on presence of SimpleFlatMapper on classpath

* Mark SimpleFlatMapperAvailable as internal

jooq/build.gradle

@@ -27,6 +27,7 @@ dependencies {
     api "org.jooq:jooq:3.13.2"
     compileOnly "org.springframework:spring-jdbc:$springVersion"
     compileOnly "io.micronaut.data:micronaut-data-tx:$micronautDataVersion"
+    compileOnly "org.simpleflatmapper:sfm-reflect:8.2.3"
 
     testRuntimeOnly project(":jdbc-tomcat")
     testRuntimeOnly "com.h2database:h2:1.4.200"

jooq/src/main/java/io/micronaut/configuration/jooq/graal/DefaultReflectionServiceSubstitute.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017-2020 original authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.micronaut.configuration.jooq.graal;
+
+import com.oracle.svm.core.annotate.Substitute;
+import com.oracle.svm.core.annotate.TargetClass;
+import org.simpleflatmapper.reflect.asm.AsmFactory;
+
+/**
+ * Disable not supported ASM bytecode manipulation in GraalVM native image runtime.
+ *
+ * @author Lukas Moravec
+ * @since 2.3.5
+ */
+@TargetClass(
+        className = "org.simpleflatmapper.reflect.DefaultReflectionService",
+        onlyWith = SimpleFlatMapperAvailable.class
+)
+final class DefaultReflectionServiceSubstitute {
+    @Substitute
+    public AsmFactory getAsmFactory(ClassLoader classLoader) {
+        return null;
+    }
+}

jooq/src/main/java/io/micronaut/configuration/jooq/graal/ProxyMapperSubstitute.java

@@ -19,7 +19,7 @@
 import com.oracle.svm.core.annotate.TargetClass;
 
 /**
- * Disable not supported ProxyMapper in GraalVM native image runtime
+ * Disable not supported ProxyMapper in GraalVM native image runtime.
  *
  * @author Lukas Moravec
  * @since 2.2.5

jooq/src/main/java/io/micronaut/configuration/jooq/graal/SimpleFlatMapperAvailable.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017-2020 original authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.micronaut.configuration.jooq.graal;
+
+import io.micronaut.core.annotation.Internal;
+
+import java.util.function.BooleanSupplier;
+
+/**
+ * Companion class for DefaultReflectionServiceSubstitute.
+ *
+ * @author Lukas Moravec
+ * @since 2.3.5
+ */
+@Internal
+public class SimpleFlatMapperAvailable implements BooleanSupplier {
+    @Override
+    public boolean getAsBoolean() {
+        try {
+            Class.forName("org.simpleflatmapper.reflect.DefaultReflectionService");
+            return true;
+        } catch (ClassNotFoundException e) {
+            return false;
+        }
+    }
+}