maven 编译异常：com.thoughtworks.xstream.converters.ConversionException
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今天用maven编译，报以奇怪异常：
mvn package -Dmaven.test.skip=true
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[INFO] ------------------------------------
[INFO] Trace
com.thoughtworks.xstream.converters.ConversionException: Cannot construct org.ap
ache.maven.plugin.war.util.WebappStructure as it does not have a no-args constru
ctor
---- Debugging information ----
message ? ? ? ? ? ? : Cannot construct org.apache.maven.plugin.war.util.WebappSt
ructure as it does not have a no-args constructor
cause-exception ? ? : com.thoughtworks.xstream.converters.reflection.ObjectAcces
sException
cause-message ? ? ? : Cannot construct org.apache.maven.plugin.war.util.WebappSt
ructure as it does not have a no-args constructor
class ? ? ? ? ? ? ? : org.apache.maven.plugin.war.util.WebappStructure
required-type ? ? ? : org.apache.maven.plugin.war.util.WebappStructure
path ? ? ? ? ? ? ? ?: /webapp-structure
line number ? ? ? ? : 1
-------------------------------
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经查与JDK版本有关，1.7版本会报以上错误。换成1.6，果断成功。
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