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经过一段时间尝试一些解决方案之后,我仍然面临着使用Proguard收缩我的jar文件后,出现NullPointerException的问题,显然是在使用Jackson库时。使用Proguard的Jackson库混淆后
这是我定义为我的Proguard的配置文件:
-injars <my_raw_filejar>.jar
-outjars <shrunk_filejar>.jar
-libraryjars <JAVA_HOME>/lib/rt.jar
-keep public class packagename.MainClass{
public static void main(java.lang.String[]);
}
-keepnames class org.codehaus.jackson.** { *; }
-keepattributes *Annotation*
-keepattributes EnclosingMethod
-keepattributes Signature
-dontobfuscate
-optimizations !code/allocation/variable
-dontoptimize
-dontwarn
-ignorewarnings
但我发现了以下错误,当我跑我产生收缩的jar:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:535)
at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:452)
at org.apache.beam.sdk.options.PipelineOptionsFactory.<clinit>(PipelineOptionsFactory.java:450)
at skry.tech.terbium.pipelines.TerbiumFeedBigTablePipeline.main(TerbiumFeedBigTablePipeline.java:30)
Caused by: java.lang.NullPointerException
at com.fasterxml.jackson.databind.cfg.MapperConfig.collectFeatureDefaults(MapperConfig.java:99)
at com.fasterxml.jackson.databind.cfg.MapperConfigBase.<clinit>(MapperConfigBase.java:31)
... 4 more
有什么发生了什么以及如何解决这个错误的线索?