During generating sources for this model:

module test {

yang-version 1;
namespace "urn:opendaylight:params:xml:ns:yang:test";
prefix "test";

revision "2017-02-24"

{ description "Initial revision of test model."; }

container testContainer {
list testList {
leaf testLeaf {
type enumeration {
enum enum1

{ value 1; }

enum enum2

{ value 2; }

}
}
}
}

notification testLeafrefNotification {
leaf tesLeafref {
type leafref

{ path "/test:testContainer/test:testList/test:testLeaf"; }

}
}

}

The exception is:

[ERROR] yang-to-sources: Unable to generate sources with org.opendaylight.mdsal.binding.javav2.maven.api.gen.plugin.CodeGeneratorImpl generator
java.lang.IllegalArgumentException: Failed to find leafref target: /test:testContainer/test:testList/test:testLeaf in module test (QNameModule

{ns=urn:openda ylight:params:xml:ns:yang:test, rev=2017-02-24}

)
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145)
at org.opendaylight.mdsal.binding.javav2.generator.yang.types.TypeProviderImpl.provideTypeForLeafref(TypeProviderImpl.java:675)
at org.opendaylight.mdsal.binding.javav2.generator.yang.types.TypeProviderImpl.javaTypeForLeafrefOrIdentityRef(TypeProviderImpl.java:612)
at org.opendaylight.mdsal.binding.javav2.generator.yang.types.TypeProviderImpl.javaTypeForSchemaDefType(TypeProviderImpl.java:440)
at org.opendaylight.mdsal.binding.javav2.generator.yang.types.TypeProviderImpl.javaTypeForSchemaDefinitionType(TypeProviderImpl.java:149)
at org.opendaylight.mdsal.binding.javav2.generator.impl.GenHelperUtil.resolveLeafSchemaNodeAsMethod(GenHelperUtil.java:658)
at org.opendaylight.mdsal.binding.javav2.generator.impl.GenHelperUtil.addSchemaNodeToBuilderAsMethod(GenHelperUtil.java:526)
at org.opendaylight.mdsal.binding.javav2.generator.impl.GenHelperUtil.resolveDataSchemaNodes(GenHelperUtil.java:220)
at org.opendaylight.mdsal.binding.javav2.generator.impl.GenHelperUtil.resolveNotification(GenHelperUtil.java:436)
at org.opendaylight.mdsal.binding.javav2.generator.impl.ModuleToGenType.notificationsToGenType(ModuleToGenType.java:147)
at org.opendaylight.mdsal.binding.javav2.generator.impl.ModuleToGenType.generate(ModuleToGenType.java:54)
at org.opendaylight.mdsal.binding.javav2.generator.impl.BindingGeneratorImpl.generateTypes(BindingGeneratorImpl.java:126)
at org.opendaylight.mdsal.binding.javav2.maven.api.gen.plugin.CodeGeneratorImpl.generateSources(CodeGeneratorImpl.java:77)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.generateSourcesWithOneGenerator(YangToSourcesProcessor.java:333)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.generateSources(YangToSourcesProcessor.java:275)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.execute(YangToSourcesProcessor.java:96)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesProcessor.conditionalExecute(YangToSourcesProcessor.java:117)
at org.opendaylight.yangtools.yang2sources.plugin.YangToSourcesMojo.execute(YangToSourcesMojo.java:121)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:200)
at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:196)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
[ERROR] yang-to-sources: One or more code generators failed, including failed list(generatorClass=exception)

{org.opendaylight.mdsal.binding.javav2.maven.api.gen.plugin.CodeGeneratorImpl=java.lang.IllegalArgumentException}

This exception is thrown when notification contains leafref to leaf which is enumeration.