[SHIRO-778] test case for onInit() called twice

config/ogdl/src/test/groovy/org/apache/shiro/config/ogdl/ReflectionBuilderTest.groovy

@@ -18,6 +18,7 @@
  */
 package org.apache.shiro.config.ogdl
 
+import org.apache.shiro.config.ogdl.beans.InitCountBean
 import org.apache.shiro.lang.codec.Base64
 import org.apache.shiro.lang.codec.CodecSupport
 import org.apache.shiro.lang.codec.Hex
@@ -26,6 +27,8 @@ import org.apache.shiro.config.Ini
 import org.apache.shiro.config.ogdl.event.BeanEvent
 import org.junit.Test
 
+import java.util.concurrent.ConcurrentHashMap
+
 import static org.junit.Assert.*
 import static org.hamcrest.Matchers.*
 
@@ -640,6 +643,37 @@ class ReflectionBuilderTest {
         assertNotNull(beanMap.get("two"))
     }
 
+    @Test
+    void testNotMultipleInitialization() {
+        // given
+        Map<String, String> defs = new ConcurrentHashMap<>()
+        defs.put("initcountbean", InitCountBean.getCanonicalName())
+        ReflectionBuilder builder = new ReflectionBuilder()
+
+        // when
+        builder.buildObjects(defs)
+
+        // then
+        assertEquals(1, InitCountBean.getInitCount())
+        InitCountBean.resetCount()
+    }
+
+    @Test
+    void testNotMultipleInitializationWithNullFirst() {
+        // given
+        Map<String, String> defs = new ConcurrentHashMap<>()
+        defs.put("initcountbean", InitCountBean.getCanonicalName())
+        ReflectionBuilder builder = new ReflectionBuilder()
+
+        // when
+        builder.buildObjects(null)
+        builder.buildObjects(defs)
+
+        // then
+        assertEquals(1, InitCountBean.getInitCount())
+        InitCountBean.resetCount()
+    }
+
     void assertInstantiatedEvents(String name, Map<String, ?> objects, int expected) {
         def bean = objects.get(name) as RecordingBeanListener
         def events = bean.getInstantiatedEvents()

config/ogdl/src/test/java/org/apache/shiro/config/ogdl/beans/InitCountBean.java

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ *
+ *     http://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 org.apache.shiro.config.ogdl.beans;
+
+import org.apache.shiro.lang.ShiroException;
+import org.apache.shiro.lang.util.Initializable;
+
+import java.util.StringJoiner;
+import java.util.concurrent.atomic.LongAdder;
+
+public class InitCountBean implements Initializable {
+    private static final LongAdder INIT_COUNT = new LongAdder();
+
+    public InitCountBean() {
+        super();
+    }
+
+    public static long getInitCount() {
+        return INIT_COUNT.longValue();
+    }
+
+    public static void resetCount() {
+        INIT_COUNT.reset();
+    }
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", InitCountBean.class.getSimpleName() + "[", "]")
+                .add("INIT_COUNT=" + getInitCount())
+                .toString();
+    }
+
+    @Override
+    public void init() throws ShiroException {
+        INIT_COUNT.increment();
+    }
+}