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Introduce @UnwrapException for Quarkus REST
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This allows users to configure exceptions
whose cause will be checked against exception mappers.

This capability already existed in Quarkus REST and was
used to map some internal exceptions, but with the new
annotation users can opt into the feature for whatever
exceptions make sense for their use case.

Closes: quarkusio#42089
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geoand committed Jul 24, 2024
1 parent ec8e234 commit 504e8e9
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7 changes: 7 additions & 0 deletions docs/src/main/asciidoc/rest.adoc
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Expand Up @@ -2271,6 +2271,13 @@ By default, methods annotated with `@ServerExceptionMapper` do **not** run CDI i
Users however can opt into interceptors by adding the corresponding annotations to the method.
====

[TIP]
====
When mapping an exception to a `@ServerExceptionMapper` method, the cause of the exception normally does not come into play.
However, in cases where the root cause of an issue is wrapped in some generic exception, the `@UnwrapException` comes in handy
for essentially using the cause when resolving the exception mapper.
====

[NOTE]
====
Εxception mappers defined in REST endpoint classes will only be called if the exception is thrown in the same class. If you want to define global exception mappers,
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Expand Up @@ -25,6 +25,7 @@
import org.jboss.jandex.IndexView;
import org.jboss.jandex.Indexer;
import org.jboss.jandex.MethodInfo;
import org.jboss.jandex.Type;
import org.jboss.resteasy.reactive.common.core.BlockingNotAllowedException;
import org.jboss.resteasy.reactive.common.model.ResourceContextResolver;
import org.jboss.resteasy.reactive.common.model.ResourceExceptionMapper;
Expand All @@ -33,6 +34,7 @@
import org.jboss.resteasy.reactive.common.processor.ResteasyReactiveDotNames;
import org.jboss.resteasy.reactive.common.processor.scanning.ApplicationScanningResult;
import org.jboss.resteasy.reactive.common.processor.scanning.ResteasyReactiveInterceptorScanner;
import org.jboss.resteasy.reactive.server.UnwrapException;
import org.jboss.resteasy.reactive.server.core.ExceptionMapping;
import org.jboss.resteasy.reactive.server.model.ContextResolvers;
import org.jboss.resteasy.reactive.server.model.ParamConverterProviders;
Expand Down Expand Up @@ -82,6 +84,9 @@
*/
public class ResteasyReactiveScanningProcessor {

private static final DotName EXCEPTION = DotName.createSimple(Exception.class);
private static final DotName RUNTIME_EXCEPTION = DotName.createSimple(RuntimeException.class);

public static final Set<DotName> CONDITIONAL_BEAN_ANNOTATIONS;

static {
Expand Down Expand Up @@ -118,11 +123,55 @@ public void accept(ResourceInterceptors interceptors) {
}

@BuildStep
public List<UnwrappedExceptionBuildItem> defaultUnwrappedException() {
public List<UnwrappedExceptionBuildItem> defaultUnwrappedExceptions() {
return List.of(new UnwrappedExceptionBuildItem(ArcUndeclaredThrowableException.class),
new UnwrappedExceptionBuildItem(RollbackException.class));
}

@BuildStep
public void applicationSpecificUnwrappedExceptions(CombinedIndexBuildItem combinedIndexBuildItem,
BuildProducer<UnwrappedExceptionBuildItem> producer) {
IndexView index = combinedIndexBuildItem.getIndex();
for (AnnotationInstance instance : index.getAnnotations(UnwrapException.class)) {
AnnotationValue value = instance.value();
if (value == null) {
// in this case we need to use the class where the annotation was placed as the exception to be unwrapped

AnnotationTarget target = instance.target();
if (target.kind() != AnnotationTarget.Kind.CLASS) {
throw new IllegalStateException(
"@UnwrapException is only supported on classes. Offending target is: " + target);
}
ClassInfo classInfo = target.asClass();
ClassInfo toCheck = classInfo;
boolean isException = false;
while (true) {
DotName superDotName = toCheck.superName();
if (EXCEPTION.equals(superDotName) || RUNTIME_EXCEPTION.equals(superDotName)) {
isException = true;
break;
}
toCheck = index.getClassByName(superDotName);
if (toCheck == null) {
break;
}
}
if (!isException) {
throw new IllegalArgumentException(
"Using @UnwrapException without a value is only supported on exception classes. Offending target is '"
+ classInfo.name() + "'.");
}

producer.produce(new UnwrappedExceptionBuildItem(classInfo.name().toString()));
} else {
Type[] exceptionTypes = value.asClassArray();
for (Type exceptionType : exceptionTypes) {
producer.produce(new UnwrappedExceptionBuildItem(exceptionType.name().toString()));
}
}
}
}

@BuildStep
public ExceptionMappersBuildItem scanForExceptionMappers(CombinedIndexBuildItem combinedIndexBuildItem,
ApplicationResultBuildItem applicationResultBuildItem,
Expand All @@ -137,7 +186,7 @@ public ExceptionMappersBuildItem scanForExceptionMappers(CombinedIndexBuildItem
exceptions.addBlockingProblem(BlockingOperationNotAllowedException.class);
exceptions.addBlockingProblem(BlockingNotAllowedException.class);
for (UnwrappedExceptionBuildItem bi : unwrappedExceptions) {
exceptions.addUnwrappedException(bi.getThrowableClass().getName());
exceptions.addUnwrappedException(bi.getThrowableClassName());
}
if (capabilities.isPresent(Capability.HIBERNATE_REACTIVE)) {
exceptions.addNonBlockingProblem(
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@@ -0,0 +1,155 @@
package io.quarkus.resteasy.reactive.server.test.customexceptions;

import static io.quarkus.resteasy.reactive.server.test.ExceptionUtil.removeStackTrace;
import static io.restassured.RestAssured.when;

import java.util.function.Supplier;

import jakarta.ws.rs.Path;
import jakarta.ws.rs.core.Response;

import org.jboss.resteasy.reactive.server.ServerExceptionMapper;
import org.jboss.resteasy.reactive.server.UnwrapException;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.spec.JavaArchive;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;

import io.quarkus.resteasy.reactive.server.test.ExceptionUtil;
import io.quarkus.test.QuarkusUnitTest;

public class UnwrapExceptionTest {

@RegisterExtension
static QuarkusUnitTest test = new QuarkusUnitTest()
.setArchiveProducer(new Supplier<>() {
@Override
public JavaArchive get() {
return ShrinkWrap.create(JavaArchive.class)
.addClasses(FirstException.class, SecondException.class, ThirdException.class,
FourthException.class, FifthException.class, SixthException.class,
Mappers.class, Resource.class, ExceptionUtil.class);
}
});

@Test
public void testWrapperWithUnmappedException() {
when().get("/hello/iaeInSecond")
.then().statusCode(500);
}

@Test
public void testMappedExceptionWithoutUnwrappedWrapper() {
when().get("/hello/iseInFirst")
.then().statusCode(500);

when().get("/hello/iseInThird")
.then().statusCode(500);

when().get("/hello/iseInSixth")
.then().statusCode(500);
}

@Test
public void testWrapperWithMappedException() {
when().get("/hello/iseInSecond")
.then().statusCode(900);

when().get("/hello/iseInFourth")
.then().statusCode(900);

when().get("/hello/iseInFifth")
.then().statusCode(900);
}

@Path("hello")
public static class Resource {

@Path("iseInFirst")
public String throwsISEAsCauseOfFirstException() {
throw removeStackTrace(new FirstException(removeStackTrace(new IllegalStateException("dummy"))));
}

@Path("iseInSecond")
public String throwsISEAsCauseOfSecondException() {
throw removeStackTrace(new SecondException(removeStackTrace(new IllegalStateException("dummy"))));
}

@Path("iaeInSecond")
public String throwsIAEAsCauseOfSecondException() {
throw removeStackTrace(new SecondException(removeStackTrace(new IllegalArgumentException("dummy"))));
}

@Path("iseInThird")
public String throwsISEAsCauseOfThirdException() throws ThirdException {
throw removeStackTrace(new ThirdException(removeStackTrace(new IllegalStateException("dummy"))));
}

@Path("iseInFourth")
public String throwsISEAsCauseOfFourthException() throws FourthException {
throw removeStackTrace(new FourthException(removeStackTrace(new IllegalStateException("dummy"))));
}

@Path("iseInFifth")
public String throwsISEAsCauseOfFifthException() {
throw removeStackTrace(new FifthException(removeStackTrace(new IllegalStateException("dummy"))));
}

@Path("iseInSixth")
public String throwsISEAsCauseOfSixthException() {
throw removeStackTrace(new SixthException(removeStackTrace(new IllegalStateException("dummy"))));
}
}

@UnwrapException({ FourthException.class, FifthException.class })
public static class Mappers {

@ServerExceptionMapper
public Response handleIllegalStateException(IllegalStateException e) {
return Response.status(900).build();
}
}

public static class FirstException extends RuntimeException {

public FirstException(Throwable cause) {
super(cause);
}
}

@UnwrapException
public static class SecondException extends FirstException {

public SecondException(Throwable cause) {
super(cause);
}
}

public static class ThirdException extends Exception {

public ThirdException(Throwable cause) {
super(cause);
}
}

public static class FourthException extends SecondException {

public FourthException(Throwable cause) {
super(cause);
}
}

public static class FifthException extends RuntimeException {

public FifthException(Throwable cause) {
super(cause);
}
}

public static class SixthException extends RuntimeException {

public SixthException(Throwable cause) {
super(cause);
}
}
}
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Expand Up @@ -3,18 +3,32 @@
import io.quarkus.builder.item.MultiBuildItem;

/**
* When an Exception of this type is thrown and no {@code jakarta.ws.rs.ext.ExceptionMapper} exists,
* When an {@link Exception} of this type is thrown and no {@code jakarta.ws.rs.ext.ExceptionMapper} exists,
* then RESTEasy Reactive will attempt to locate an {@code ExceptionMapper} for the cause of the Exception.
*/
public final class UnwrappedExceptionBuildItem extends MultiBuildItem {

private final Class<? extends Throwable> throwableClass;
private final String throwableClassName;

public UnwrappedExceptionBuildItem(Class<? extends Throwable> throwableClass) {
this.throwableClass = throwableClass;
public UnwrappedExceptionBuildItem(String throwableClassName) {
this.throwableClassName = throwableClassName;
}

public UnwrappedExceptionBuildItem(Class<? extends Throwable> throwableClassName) {
this.throwableClassName = throwableClassName.getName();
}

@Deprecated(forRemoval = true)
public Class<? extends Throwable> getThrowableClass() {
return throwableClass;
try {
return (Class<? extends Throwable>) Class.forName(throwableClassName, false,
Thread.currentThread().getContextClassLoader());
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}

public String getThrowableClassName() {
return throwableClassName;
}
}
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Expand Up @@ -41,6 +41,8 @@
* <p>
* The return type of the method must be either be of type {@code Response}, {@code Uni<Response>}, {@code RestResponse} or
* {@code Uni<RestResponse>}.
* <p>
* See also {@link UnwrapException}
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
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@@ -0,0 +1,23 @@
package org.jboss.resteasy.reactive.server;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
* Used to configure that an exception (or exceptions) should be unwrapped during exception handling.
* <p>
* Unwrapping means that when an {@link Exception} of the configured type is thrown and no
* {@code jakarta.ws.rs.ext.ExceptionMapper} exists,
* then RESTEasy Reactive will attempt to locate an {@code ExceptionMapper} for the cause of the Exception.
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface UnwrapException {

/**
* If this is not set, the value is assumed to be the exception class where the annotation is placed
*/
Class<? extends Exception>[] value() default {};
}

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