[jira] [Commented] (AVRO-1927) If a default value is set, Avro allows null values in non-nullable fields.

["Andreas Maier (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-1927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568867#comment-15568867 ] 

Andreas Maier commented on AVRO-1927:
-------------------------------------

Sorry for the long delay. I was on vacation.
I tried the code you suggested. You are right, it does throw a NullPointerException when I try to write the object:
{code}
java.lang.NullPointerException: null of string of de.am.MyObject

	at org.apache.avro.generic.GenericDatumWriter.npe(GenericDatumWriter.java:132)
	at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:126)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:73)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:60)
	at de.am.MyObjectTest.myObjectTest2(MyObjectTest.java:27)
	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:498)
	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.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.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
	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:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.NullPointerException
	at org.apache.avro.specific.SpecificDatumWriter.writeString(SpecificDatumWriter.java:67)
	at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:115)
	at org.apache.avro.specific.SpecificDatumWriter.writeField(SpecificDatumWriter.java:87)
	at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:143)
	at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:105)
	... 30 more
{code}

> If a default value is set, Avro allows null values in non-nullable fields.
> --------------------------------------------------------------------------
>
>                 Key: AVRO-1927
>                 URL: https://issues.apache.org/jira/browse/AVRO-1927
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.8.1
>            Reporter: Andreas Maier
>              Labels: newbie
>
> With an avro schema like
> {code}
> {
>   "name": "myfield",
>   "type": "string",
>   "default": ""
> }
> {code}
> the following code should throw an exception
> {code}
> MyObject myObject = MyObject.newBuilder().setMyfield(null).build();
> {code}
> But instead the value of myfield is set to null, which causes an exception later when serializing myObject, because null is not a valid value for myfield. 
> I believe in this case setMyfield(null) should throw an exception, independent of the value of default. 
> See also
> https://stackoverflow.com/questions/38509279/generated-avro-builder-set-null-doesnt-overwrite-with-default



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