Generic R2DBC Custom Converter - postgresql

Question

I am using postgres database with reactive repository and R2dbc and have more than 5 json fields.
R2dbc does not directly recognize the jsonb fields and hence cannot map it to java object.
So after following various docs - I came to know a solution - custom converters.
So, I created converters for all fields. However, then I saw that the code in all the converters were same - just the class mapped were different (POJOs).
Hence, I thought of creating a generic class for the converters.
However, Spring is not recognizing the generic class but works with a separate converter for all the fields.
I would like to add more json fields in future and do not want to create a separate converter class for each.
Please help me with this issue.
Entity Class:
#Data
#Table("person")
public class Person {
#Id
private Integer id;
private String uid;
private AddressInfo address;
...
}
Working custom converter for one of field:
#ReadingConverter
#Slf4j
public class JsonToAddressInfoConverter implements Converter<Json, AddressInfo> {
#Override
public AddressInfo convert(Json json) {
try {
ObjectMapper mapper = new ObjectMapper();
AddressInfo addressInfo = mapper.readValue(json.asString(), AddressInfo.class);
return addressInfo;
} catch (IOException e) {
log.error("Problem while parsing JSON: {}", json, e);
}
return new AddressInfo();
}
}
Generic converter that I am trying to create - (not working)
#ReadingConverter
#Slf4j
public class JsonToSimplePojoConverter<S, T> implements Converter<S, T> {
final Class<T> typeParameterClass;
public JsonToSimplePojoConverter(Class<T> typeParameterClass) {
super();
this.typeParameterClass = typeParameterClass;
}
#Override
public T convert(S json) {
T object = null;
try {
ObjectMapper mapper = new ObjectMapper();
object = mapper.readValue(((Json) json).asString(), typeParameterClass);
} catch (IOException e) {
log.error("Problem while parsing JSON: {}", json, e);
}
return object;
}
}
Configuration class where converter is registered:
#Configuration
public class ReactivePostgresConfig extends AbstractR2dbcConfiguration {
#Override
public ConnectionFactory connectionFactory() {
return null;
}
#Bean
#Override
public R2dbcCustomConversions r2dbcCustomConversions() {
List<Converter<?, ?>> converters = new ArrayList<>();
// converters.add(new JsonToAddressInfoConverter());
converters.add(new JsonToSimplePojoConverter< Json, AddressInfo >( AddressInfo.class));
return R2dbcCustomConversions.of(PostgresDialect.INSTANCE, converters);
}
}
Error that I am getting on app initialization:
Caused by: java.lang.IllegalStateException: Couldn't resolve type arguments for class com.kredx.service.converters.JsonToSimplePojoConverter
at org.springframework.data.convert.CustomConversions$StoreConversions.getRegistrationFor(CustomConversions.java:805) ~[spring-data-commons-2.7.2.jar:2.7.2]
at org.springframework.data.convert.CustomConversions$StoreConversions.getRegistrationsFor(CustomConversions.java:787) ~[spring-data-commons-2.7.2.jar:2.7.2]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[na:na]
at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[na:na]
at org.springframework.data.convert.CustomConversions.collectPotentialConverterRegistrations(CustomConversions.java:201) ~[spring-data-commons-2.7.2.jar:2.7.2]
at org.springframework.data.convert.CustomConversions.<init>(CustomConversions.java:112) ~[spring-data-commons-2.7.2.jar:2.7.2]
at org.springframework.data.r2dbc.convert.R2dbcCustomConversions.<init>(R2dbcCustomConversions.java:60) ~[spring-data-r2dbc-1.5.2.jar:1.5.2]
at org.springframework.data.r2dbc.convert.R2dbcCustomConversions.of(R2dbcCustomConversions.java:88) ~[spring-data-r2dbc-1.5.2.jar:1.5.2]
at com.kredx.service.config.ReactivePostgresConfig.r2dbcCustomConversions(ReactivePostgresConfig.java:39) ~[classes/:na]
at com.kredx.service.config.ReactivePostgresConfig$$EnhancerBySpringCGLIB$$b372d1fb.CGLIB$r2dbcCustomConversions$1(<generated>) ~[classes/:na]
at com.kredx.service.config.ReactivePostgresConfig$$EnhancerBySpringCGLIB$$b372d1fb$$FastClassBySpringCGLIB$$2d0d2d10.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.3.22.jar:5.3.22]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) ~[spring-context-5.3.22.jar:5.3.22]
at com.kredx.service.config.ReactivePostgresConfig$$EnhancerBySpringCGLIB$$b372d1fb.r2dbcCustomConversions(<generated>) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.22.jar:5.3.22]
... 114 common frames omitted
I am using Spring reactive + r2dbc + postgressql
Any Help is appreciated.