Okay, let me fully explain what I'm trying to do. I'll take a simple
example. I'm trying to read data from Consul. So, I'm using a
WebTarget-based implementation to talk to Consul, but I'm trying to use
JSON-B to parse the response. I have a ConsulNode class:
public class ConsulNode {
@JsonbProperty("Key")
private final String key;
@JsonbProperty("Value")
private final String value;
public ConsulNode(String key, String value) {
this.key = key;
this.value = value;
}
public String getKey() {
return key;
}
public String getValue() {
return value;
}
}
When I attempt to parse the response into a List<ConsulNode>, I get the
following exception:
javax.json.bind.JsonbException: class
org.microbule.config.consul.ConsulNode not instantiable
at org.apache.johnzon.jsonb.JohnsonJsonb.fromJson(JohnsonJsonb.java:160)
at
org.microbule.config.consul.ConsulConfigProviderTest.parseResponse(ConsulConfigProviderTest.java:83)
at
org.microbule.config.consul.ConsulConfigProviderTest.testGetConfig(ConsulConfigProviderTest.java:75)
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:497)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at
org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
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$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at
com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at
com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
at
com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.apache.johnzon.mapper.MapperException: class
org.microbule.config.consul.ConsulNode not instantiable
at
org.apache.johnzon.mapper.MappingParserImpl.buildObject(MappingParserImpl.java:281)
at
org.apache.johnzon.mapper.MappingParserImpl.toObject(MappingParserImpl.java:484)
at
org.apache.johnzon.mapper.MappingParserImpl.mapCollection(MappingParserImpl.java:603)
at
org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:175)
at
org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:127)
at
org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:117)
at org.apache.johnzon.mapper.Mapper.mapObject(Mapper.java:236)
at org.apache.johnzon.mapper.Mapper.readCollection(Mapper.java:207)
at org.apache.johnzon.jsonb.JohnsonJsonb.fromJson(JohnsonJsonb.java:151)
... 28 more
On Sat, Jun 24, 2017 at 8:55 AM Romain Manni-Bucau <[email protected]>
wrote:
> Have to admit I don't fully see the use case since noarg contructors are
> not mandatory but JOHNZON-130 opens the doort to custom extensions.
>
> If the need is something like myInstance == jsonMapper.map(myInstance,
> input) it shouldnt be hard to extract it from our mapper but not sure how
> we would wire it in jsonb api, probably accesMode can help with a
> threadlocal or so.
>
>
> Romain Manni-Bucau
> @rmannibucau <https://twitter.com/rmannibucau> | Blog
> <https://blog-rmannibucau.rhcloud.com> | Old Blog
> <http://rmannibucau.wordpress.com> | Github <
> https://github.com/rmannibucau> |
> LinkedIn <https://www.linkedin.com/in/rmannibucau> | JavaEE Factory
> <https://javaeefactory-rmannibucau.rhcloud.com>
>
> 2017-06-24 14:49 GMT+02:00 James Carman <[email protected]>:
>
> > Well, my use case is that I want to let Johnzon instantiate objects when
> > there is no special annotation or factory method present. I just want it
> > to instantiate the object and then populate the fields. I realize this
> is
> > somewhat niche, so I don't know if I'll push a PR for the implementation,
> > unless you guys want me to. This will mimic what I currently have with
> > GSON which proves to be very convenient, especially in JAX-RS.
> >
> > On Sat, Jun 24, 2017 at 8:28 AM Romain Manni-Bucau <
> [email protected]>
> > wrote:
> >
> > > Internals:
> > >
> > > in general you do builder.setAccessMode(accessMode);
> > > but in jsonb context we didnt wire it yet cause we enforce
> > > JsonbAccessMode but
> > > we can surely still expose it (in particular read from jsonbconfig
> > > properties the delegate).
> > >
> > > Spec:
> > >
> > > In jsonb we have @JsonbCreator support for constructors.
> > >
> > >
> > > Romain Manni-Bucau
> > > @rmannibucau <https://twitter.com/rmannibucau> | Blog
> > > <https://blog-rmannibucau.rhcloud.com> | Old Blog
> > > <http://rmannibucau.wordpress.com> | Github <
> > > https://github.com/rmannibucau> |
> > > LinkedIn <https://www.linkedin.com/in/rmannibucau> | JavaEE Factory
> > > <https://javaeefactory-rmannibucau.rhcloud.com>
> > >
> > > 2017-06-24 14:19 GMT+02:00 James Carman <[email protected]>:
> > >
> > > > Are there docs on how to provide my own AccessMode implementation?
> > > >
> > > >
> > > >
> > > > On Sat, Jun 24, 2017 at 8:16 AM Romain Manni-Bucau <
> > > [email protected]>
> > > > wrote:
> > > >
> > > > > Using a custom accessmode you can.
> > > > >
> > > > > Side note: we have constructor support I think.
> > > > >
> > > > > Le 24 juin 2017 13:59, "James Carman" <[email protected]>
> a
> > > > > écrit :
> > > > >
> > > > > > Current, with Johnzon, I can't instantiate objects for classes
> > where
> > > I
> > > > > have
> > > > > > no default constructor available. With GSON, it supports this
> > using
> > > > the
> > > > > > Unsafe class I believe. Is there a way for me to provide my own
> > > > > > instantiator implementation (I'd probably pick Objenesis)? I
> don't
> > > > want
> > > > > to
> > > > > > have to provide default constructors for all of my immutable
> > > "request"
> > > > > > objects when using Johnzon in my JAX-RS MessageBodyReader/
> > > > > > MessageBodyWriter.
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > > James
> > > > > >
> > > > >
> > > >
> > >
> >
>
