为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
【DM版本】:V8
【操作系统】：linux
【CPU】:
【问题描述】*：

DEM新建连接，勾选注册连接则报错，不勾选则正常。

后台 dem.log 报错信息如下：[ERROR] Type 'com.google.gson.internal.LinkedTreeMap' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = {}
com.google.gwt.user.client.rpc.SerializationException: Type 'com.google.gson.internal.LinkedTreeMap' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = {}
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:667) ~[gwt-servlet.jar:?]
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeClass(ServerSerializationStreamWriter.java:758) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeImpl(ServerSerializationStreamWriter.java:797) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:669) ~[gwt-servlet.jar:?]
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter$ValueWriter$8.write(ServerSerializationStreamWriter.java:153) ~[gwt-servlet.jar:?]
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeValue(ServerSerializationStreamWriter.java:587) ~[gwt-servlet.jar:?]