diff --git a/apm-collector/apm-collector-cache/collector-cache-define/src/main/java/org/skywalking/apm/collector/cache/CacheServiceManager.java b/apm-collector/apm-collector-cache/collector-cache-define/src/main/java/org/skywalking/apm/collector/cache/CacheServiceManager.java
deleted file mode 100644
index 2c98c0927..000000000
--- a/apm-collector/apm-collector-cache/collector-cache-define/src/main/java/org/skywalking/apm/collector/cache/CacheServiceManager.java
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright 2017, OpenSkywalking Organization All rights reserved.
- *
- * 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
- *
- *     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.
- *
- * Project repository: https://github.com/OpenSkywalking/skywalking
- */
-
-package org.skywalking.apm.collector.cache;
-
-import org.skywalking.apm.collector.cache.service.ApplicationCacheService;
-import org.skywalking.apm.collector.cache.service.InstanceCacheService;
-import org.skywalking.apm.collector.cache.service.ServiceIdCacheService;
-import org.skywalking.apm.collector.cache.service.ServiceNameCacheService;
-import org.skywalking.apm.collector.core.module.ModuleManager;
-import org.skywalking.apm.collector.core.module.ModuleNotFoundException;
-import org.skywalking.apm.collector.core.module.ServiceNotProvidedException;
-
-/**
- * @author peng-yongsheng
- */
-public class CacheServiceManager {
-
-    private ApplicationCacheService applicationCacheService;
-    private InstanceCacheService instanceCacheService;
-    private ServiceIdCacheService serviceIdCacheService;
-    private ServiceNameCacheService serviceNameCacheService;
-
-    public ApplicationCacheService getApplicationCacheService() {
-        return applicationCacheService;
-    }
-
-    public InstanceCacheService getInstanceCacheService() {
-        return instanceCacheService;
-    }
-
-    public ServiceIdCacheService getServiceIdCacheService() {
-        return serviceIdCacheService;
-    }
-
-    public ServiceNameCacheService getServiceNameCacheService() {
-        return serviceNameCacheService;
-    }
-
-    public void init(ModuleManager moduleManager) throws ModuleNotFoundException, ServiceNotProvidedException {
-        this.applicationCacheService = moduleManager.find(CacheModule.NAME).getService(ApplicationCacheService.class);
-        this.instanceCacheService = moduleManager.find(CacheModule.NAME).getService(InstanceCacheService.class);
-        this.serviceIdCacheService = moduleManager.find(CacheModule.NAME).getService(ServiceIdCacheService.class);
-        this.serviceNameCacheService = moduleManager.find(CacheModule.NAME).getService(ServiceNameCacheService.class);
-    }
-}
diff --git a/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ModuleNotFoundRuntimeException.java b/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ModuleNotFoundRuntimeException.java
new file mode 100644
index 000000000..324990fb3
--- /dev/null
+++ b/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ModuleNotFoundRuntimeException.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2017, OpenSkywalking Organization All rights reserved.
+ *
+ * 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
+ *
+ *     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.
+ *
+ * Project repository: https://github.com/OpenSkywalking/skywalking
+ */
+
+package org.skywalking.apm.collector.core.module;
+
+/**
+ * @author peng-yongsheng
+ */
+public class ModuleNotFoundRuntimeException extends RuntimeException {
+
+    public ModuleNotFoundRuntimeException(Throwable cause) {
+        super(cause);
+    }
+
+    public ModuleNotFoundRuntimeException(String message) {
+        super(message);
+    }
+}
diff --git a/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ServiceNotProvidedRuntimeException.java b/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ServiceNotProvidedRuntimeException.java
new file mode 100644
index 000000000..a054f2b93
--- /dev/null
+++ b/apm-collector/apm-collector-core/src/main/java/org/skywalking/apm/collector/core/module/ServiceNotProvidedRuntimeException.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2017, OpenSkywalking Organization All rights reserved.
+ *
+ * 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
+ *
+ *     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.
+ *
+ * Project repository: https://github.com/OpenSkywalking/skywalking
+ */
+
+package org.skywalking.apm.collector.core.module;
+
+public class ServiceNotProvidedRuntimeException extends RuntimeException {
+    public ServiceNotProvidedRuntimeException(String message) {
+        super(message);
+    }
+}