"generate build" falls with JSON parsing error

[snoopy-coder]

Launching "generate build" falls with JSON parsing error:

C:\Temp\qemu-java-master>gradlew generate build
:qemu-qapi:compileGenerateJava
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
:qemu-qapi:processGenerateResources
:qemu-qapi:generateClasses
:qemu-qapi:generate
Exception in thread "main" com.google.gson.JsonSyntaxException: Failed to parse {"enum":"BlockdevAioOptions","data":["threads","native",{"name":"io_uring","if":
"defined(CONFIG_LINUX_IO_URING)"}]}
        at org.anarres.qemu.qapi.generator.SchemaParser.parse(SchemaParser.java:118)
        at org.anarres.qemu.qapi.generator.Main.main(Main.java:43)
Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
        at com.google.gson.TypeAdapter.fromJsonTree(TypeAdapter.java:281)
        at org.anarres.qemu.qapi.generator.SchemaParser.parse(SchemaParser.java:116)
        ... 1 more
Caused by: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
        at com.google.gson.internal.bind.JsonTreeReader.nextString(JsonTreeReader.java:154)
        at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:358)
        at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:346)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:103)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:196)
        ... 3 more
:qemu-qapi:generate FAILED

FAILURE: Build failed with an exception.

If I am not mistaken, nested objects parsing is not supported yet?
Is it difficult to add this feature?
Thanks a lot.

[snoopy-coder]

A few days ago, the error message is slightly changed:

C:\Temp\qemu-java-master>gradlew generate build
:qemu-qapi:compileGenerateJava UP-TO-DATE
:qemu-qapi:processGenerateResources UP-TO-DATE
:qemu-qapi:generateClasses UP-TO-DATE
:qemu-qapi:generate
Exception in thread "main" com.google.gson.JsonSyntaxException: Failed to parse {"enum":"MultiFDCompression","data":["none","zlib",{"name":"zstd","if":"defined(
CONFIG_ZSTD)"}]}:qemu-qapi:generate
        at org.anarres.qemu.qapi.generator.SchemaParser.parse(SchemaParser.java:118)
        at org.anarres.qemu.qapi.generator.Main.main(Main.java:43)
Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:200)
        at com.google.gson.TypeAdapter.fromJsonTree(TypeAdapter.java:281)
        at org.anarres.qemu.qapi.generator.SchemaParser.parse(SchemaParser.java:116)
        ... 1 more
Caused by: java.lang.IllegalStateException: Expected STRING but was BEGIN_OBJECT
        at com.google.gson.internal.bind.JsonTreeReader.nextString(JsonTreeReader.java:154)
        at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:358)
        at com.google.gson.internal.bind.TypeAdapters$13.read(TypeAdapters.java:346)
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:103)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:196)
        ... 3 more
:qemu-qapi:generate FAILED

FAILURE: Build failed with an exception.

As I understand it, something like https://github.com/wnameless/json-flattener should be used when parsing. Can anybody help in implementation? I would be very grateful.