java.lang.ExceptionInInitializerError

Question

I have an Android app with the Dropbox Java api 3.0.5
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For some reason some of my users get the exception I'm pasting below, but the majority do not. I've never reproduced the issue, I've only seen it reported on Crashlytics.
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Does anyone have any idea what the issue could be? I use multidex on my app, is it maybe related to that?
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Thank you.
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Fatal Exception: java.lang.ExceptionInInitializerError
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.buildUserAgentHeader(DbxRequestUtil.java:151)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.addUserAgentHeader(DbxRequestUtil.java:136)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.startPostRaw(DbxRequestUtil.java:233)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2$1.execute(DbxRawClientV2.java:107)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2.executeRetriable(DbxRawClientV2.java:284)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2.rpcStyle(DbxRawClientV2.java:102)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.users.DbxUserUsersRequests.getCurrentAccount(DbxUserUsersRequests.java:120)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at mypackage.UserDropbox.(UserDropbox.java)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at mypackage.DropboxHelper$1.run(DropboxHelper.java)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.Thread.run(Thread.java:818)
Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'void java.util.jar.JarVerifier.removeMetaEntries()' on a null object reference
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.jar.JarFile.getInputStream(JarFile.java:381)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at libcore.net.url.JarURLConnectionImpl.getInputStream(JarURLConnectionImpl.java:222)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.net.URL.openStream(URL.java:470)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.getResourceAsStream(ClassLoader.java:444)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.Class.getResourceAsStream(Class.java:1412)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxSdkVersion.loadLineFromResource(DbxSdkVersion.java:34)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxSdkVersion.loadVersion(DbxSdkVersion.java:56)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxSdkVersion.(DbxSdkVersion.java)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.buildUserAgentHeader(DbxRequestUtil.java:151)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.addUserAgentHeader(DbxRequestUtil.java:136)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.DbxRequestUtil.startPostRaw(DbxRequestUtil.java:233)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2$1.execute(DbxRawClientV2.java:107)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2.executeRetriable(DbxRawClientV2.java:284)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.DbxRawClientV2.rpcStyle(DbxRawClientV2.java:102)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.dropbox.core.v2.users.DbxUserUsersRequests.getCurrentAccount(DbxUserUsersRequests.java:120)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at mypackage.UserDropbox.(UserDropbox.java)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at mypackage.DropboxHelper$1.run(DropboxHelper.java)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.Thread.run(Thread.java:818)

Greg-DB · Answer

[Cross-linking for reference:&nbsp;https://stackoverflow.com/questions/47537572/exception-while-dropbox-api-tries-to-read-a-resource-might-be-multidex-issue ]
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I unfortunately have not seen this issue before. Do you know if it seems to be specific to any particular Android version, device, etc.?

casolorz · Answer

So far Android 5 and 6, seems to be on Motorola phones, Samsung phones, and some weird brand I've never head of. I only have this in beta so I don't have that many reports yet.

Greg-DB · Answer

Thanks! There doesn't seem to be a clear pattern in that unfortunately.
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For reference, the Dropbox Java SDK contains a "sdk-version.txt" file with the version number for the SDK in it, for use in the User-Agent header string.
&nbsp;
Based on the stack trace you shared, it appears the exception is occurring inside Java's getResourceAsStream, when the Dropbox SDK asks for an input stream for that&nbsp;"sdk-version.txt" file.
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It's unclear why that may be happening, so I'll ask engineering to look into it.
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casolorz · Answer

That is good to know. I'm wondering if my proguard is maybe renaming that or multidex is putting it on a second dex file and it is having issues getting it out there. I've had that happen before with multidex but only during the Application onCreate.

My proguard file has:

-keep class com.dropbox.** { *; }
-keepclassmembers class com.dropbox.** { *; }

Maybe I need to add something else to my multidex config to tell it to keep that file on the on the first dex file.

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java.lang.ExceptionInInitializerError

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