Question

我有一个小程序，在eclipse中一切正常，但是，当我导出jar，并嵌入我的网站（我必须嵌入每个杰克逊jar），我得到这个错误：

com.fasterxml.jackson.databind.JsonMappingException: Can not access public ticket.Ticket() (from class ticket.Ticket; failed to set access: access denied ("java.lang.reflect.ReflectPermission" "suppressAccessChecks")
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:272)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:247)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:146)
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:322)
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:2990)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2884)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
at ticket.Main.init(Main.java:56)
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.init(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Can not access public ticket.Ticket() (from class ticket.Ticket; failed to set access: access denied ("java.lang.reflect.ReflectPermission" "suppressAccessChecks")
at com.fasterxml.jackson.databind.util.ClassUtil.checkAndFixAccess(ClassUtil.java:510)
at com.fasterxml.jackson.databind.deser.impl.CreatorCollector._fixAccess(CreatorCollector.java:203)
at com.fasterxml.jackson.databind.deser.impl.CreatorCollector.setDefaultConstructor(CreatorCollector.java:106)
at com.fasterxml.jackson.databind.deser.impl.CreatorCollector.setDefaultCreator(CreatorCollector.java:123)
at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._addDeserializerConstructors(BasicDeserializerFactory.java:369)
at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory._constructDefaultValueInstantiator(BasicDeserializerFactory.java:315)
at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.findValueInstantiator(BasicDeserializerFactory.java:259)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.buildBeanDeserializer(BeanDeserializerFactory.java:263)
at com.fasterxml.jackson.databind.deser.BeanDeserializerFactory.createBeanDeserializer(BeanDeserializerFactory.java:168)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:401)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:354)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:267)
... 10 more

在这种情况下我该怎么办？

Answer 1

尝试反射的小程序需要由开发人员digitally signed，并在提示时由用户信任。

Answer 2

除了签名之外，您应该可以通过停用MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS来避免此问题，（请参阅javadoc）。这可以防止您失败的特定呼叫;对于非applet用例，这对于访问和性能原因很重要;但它需要安全管理员允许它。

Applet和jackson外部罐子：无法访问公共类

2 个答案: