Trouble with Context on bitcoinj 0.13.2

Hi, first i had a “You must construct a Context object before using bitcoinj!” even if this version should support automatic Context injection. Test code

final byte[] payloadBytes = Bitcoin.fromHex(hex);
final org.bitcoinj.core.Transaction starting = new org.bitcoinj.core.Transaction(MainNetParams.get(), payloadBytes);
System.out.println("starting:"+starting);  //Exception here

I solve this issue explicitly calling before that code

Context.getOrCreate(MainNetParams.get());

But this works in local, while in appengine I got:

java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "modifyThreadGroup")

turning back to 0.12.3 for now.

[mikehearn]

App Engine has a specific, non-standard API for the creation of threads. Any attempt to create a thread in the normal Java manner will fail.

This would be awkward to support in the extreme: the fact that your app works in previous versions of bitcoinj is just blind luck. It’s not something we ever supported, so this is not a “bug” in the pedantic sense.

However there is a simple solution for you: compile your own bitcoinj and in the Threading class, remove the code that initialises USER_THREAD.

[jlopp]

FYI I get the same error while running a unit test in Eclipse after upgrading to BitcoinJ 0.13.3:

org.bitcoinj.store.BlockStoreException: java.lang.IllegalStateException: You must construct a Context object before using bitcoinj!
    at com.bitgo.BitGoService.BlockStore.getStoredBlock(BlockStore.java:138)
    at com.bitgo.BitGoService.BlockStoreTest.putAndGet(BlockStoreTest.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.IllegalStateException: You must construct a Context object before using bitcoinj!
    at org.bitcoinj.core.Context.get(Context.java:77)
    at org.bitcoinj.core.Transaction.getConfidence(Transaction.java:1143)
    at org.bitcoinj.core.Block.parseTransactions(Block.java:219)
    at org.bitcoinj.core.Block.parse(Block.java:233)
    at org.bitcoinj.core.Message.<init>(Message.java:114)
    at org.bitcoinj.core.Message.<init>(Message.java:150)
    at org.bitcoinj.core.Block.<init>(Block.java:117)
    at com.bitgo.BitGoService.BlockStore.getStoredBlock(BlockStore.java:136)