带有简单 XML serializer.write 的神秘空指针异常
我在使用 Simple Xml Serializer 从 Android 项目中的复杂对象构建消息时遇到问题。奇怪的是，昨天它运行良好；序列化对象已写入 StringWriter，一切顺利。出于某种原因，我现在得到了这个：
03-08 12:01:12.884: WARN/System.err(444): java.lang.NullPointerException
at org.simpleframework.xml.core.Traverser.write(Traverser.java:225)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:208)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:186)
at org.simpleframework.xml.core.Persister.write(Persister.java:1187)
at org.simpleframework.xml.core.Persister.write(Persister.java:1169)
at org.simpleframework.xml.core.Persister.write(Persister.java:1147)
它在serializer.write()线上不断爆炸，我不明白为什么。
//xmlMsg is the object to be serialized.
Serializer serializer = new Persister();
StringWriter outMsg = null;
serializer.write(xmlMsg, outMsg);
I'm having trouble using Simple Xml Serializer to build a Message from a complex object in my android project. The strange part is that it worked fine yesterday; the serialized object was written to a StringWriter and all was well. For some reason I now get this:
03-08 12:01:12.884: WARN/System.err(444): java.lang.NullPointerException
at org.simpleframework.xml.core.Traverser.write(Traverser.java:225)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:208)
at org.simpleframework.xml.core.Traverser.write(Traverser.java:186)
at org.simpleframework.xml.core.Persister.write(Persister.java:1187)
at org.simpleframework.xml.core.Persister.write(Persister.java:1169)
at org.simpleframework.xml.core.Persister.write(Persister.java:1147)
It keeps blowing up on the serializer.write() line and I can't figure out why.
//xmlMsg is the object to be serialized.
Serializer serializer = new Persister();
StringWriter outMsg = null;
serializer.write(xmlMsg, outMsg);
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从 javadoc 看来，该方法将尝试写入
Writer参数似乎是合理的，因此它不应该是null。From the javadoc it seems reasonable to me that the method will attempt to write to the
Writerparameter, thus it shouldn't benull.