Can Dava decompile these classes?

java.lang.ClassLoader
java.lang.ref.Reference$ReferenceHandler
java.io.ObjectInputStream
java.io.ObjectOutputStream
sun.io.CharToByteConverter
sun.io.ByteToCharConverter

I attatched what I got below. Does anybody get the same result? Does anybody know how to fix this? Any help would be appreciated!

-Ruijie

Decompiling java.lang.ClassLoader...
Exception in thread "main" java.lang.NullPointerException
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.perform_ChildOrder
(LabeledBlockFinder.java:95)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:216)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.find(LabeledBlockF
inder.java:45)
        at soot.dava.DavaBody.<init>(DavaBody.java:169)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)

Decompiling java.lang.ref.Reference$ReferenceHandler...
Exception in thread "main" java.util.NoSuchElementException
        at java.util.LinkedList.getLast(Unknown Source)
        at soot.dava.toolkits.base.finders.SynchronizedBlockFinder.find_Variable
Increasing(SynchronizedBlockFinder.java:191)
        at soot.dava.toolkits.base.finders.SynchronizedBlockFinder.set_MonitorLe
vels(SynchronizedBlockFinder.java:345)
        at soot.dava.toolkits.base.finders.SynchronizedBlockFinder.find(Synchron
izedBlockFinder.java:57)
        at soot.dava.DavaBody.<init>(DavaBody.java:166)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)

Decompiling java.io.ObjectInputStream...
Exception in thread "main" java.lang.NullPointerException
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.perform_ChildOrder
(LabeledBlockFinder.java:95)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:216)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.find(LabeledBlockF
inder.java:45)
        at soot.dava.DavaBody.<init>(DavaBody.java:169)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)

Decompiling java.io.ObjectOutputStream...
Exception in thread "main" java.lang.NullPointerException
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.perform_ChildOrder
(LabeledBlockFinder.java:95)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:216)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.find(LabeledBlockF
inder.java:45)
        at soot.dava.DavaBody.<init>(DavaBody.java:169)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)

Decompiling sun.io.CharToByteConverter...
Exception in thread "main" java.lang.NullPointerException
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.perform_ChildOrder
(LabeledBlockFinder.java:95)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:216)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.find(LabeledBlockF
inder.java:45)
        at soot.dava.DavaBody.<init>(DavaBody.java:169)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)

Decompiling sun.io.ByteToCharConverter...
Exception in thread "main" java.lang.NullPointerException
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.perform_ChildOrder
(LabeledBlockFinder.java:95)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:216)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.internal.SET.SETNode.find_LabeledBlocks(SETNode.java:213)
        at soot.dava.toolkits.base.finders.LabeledBlockFinder.find(LabeledBlockF
inder.java:45)
        at soot.dava.DavaBody.<init>(DavaBody.java:169)
        at soot.dava.Dava.newBody(Dava.java:68)
        at soot.PackManager.runBodyPacks(PackManager.java:510)
        at soot.PackManager.runBodyPacks(PackManager.java:318)
        at soot.PackManager.runPacks(PackManager.java:278)
        at soot.Main.run(Main.java:180)
        at soot.Main.main(Main.java:154)