Details
Description
I have written a simple adapter to allow the serialization and deserialization of Java Path objects. The adapter works fine using Yasson (which claims to be a reference implementation), but both serialization and deserialization fail in Johnzon.
Serialization results in a StackOverflowError:
java.lang.StackOverflowError at org.apache.johnzon.core.JsonGeneratorImpl.currentState(JsonGeneratorImpl.java:676) at org.apache.johnzon.core.JsonGeneratorImpl.prepareValue(JsonGeneratorImpl.java:641) at org.apache.johnzon.core.JsonGeneratorImpl.writeStartArray(JsonGeneratorImpl.java:161) at org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteIterable(MappingGeneratorImpl.java:682) at org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteObject(MappingGeneratorImpl.java:156) at org.apache.johnzon.mapper.MappingGeneratorImpl.writeItem(MappingGeneratorImpl.java:672) at org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteIterable(MappingGeneratorImpl.java:691) at org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteObject(MappingGeneratorImpl.java:156) at org.apache.johnzon.mapper.MappingGeneratorImpl.writeItem(MappingGeneratorImpl.java:672) at org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteIterable(MappingGeneratorImpl.java:691) ...
Deserialization results in an IllegalArgumentException:
java.lang.IllegalArgumentException: Unsupported "/example/file.txt" for type interface java.nio.file.Path at org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:238) at org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:139) at org.apache.johnzon.mapper.MappingParserImpl.readObject(MappingParserImpl.java:131) at org.apache.johnzon.mapper.Mapper.mapObject(Mapper.java:371) at org.apache.johnzon.mapper.Mapper.readObject(Mapper.java:297) at org.apache.johnzon.mapper.Mapper.readObject(Mapper.java:292) at org.apache.johnzon.jsonb.JohnzonJsonb.fromJson(JohnzonJsonb.java:77) at org.example.json.serialization.PathAdapterTest.testDeserialize(PathAdapterTest.java:25) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686) at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60) at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131) at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149) at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140) at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84) at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115) at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105) at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:212) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:208) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.base/java.util.ArrayList.forEach(ArrayList.java:1540) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
The code is as follows:
PathAdapter.java
package org.example.json.serialization; import javax.json.Json; import javax.json.JsonString; import javax.json.bind.adapter.JsonbAdapter; import java.nio.file.Path; public class PathAdapter implements JsonbAdapter<Path, JsonString> { @Override public JsonString adaptToJson(Path path) { return Json.createValue(path.toString()); } @Override public Path adaptFromJson(JsonString jsonString) { return Path.of(jsonString.getString()); } }
PathAdapterTest.java
package org.example.json.serialization; import org.junit.jupiter.api.Test; import javax.json.bind.Jsonb; import javax.json.bind.JsonbBuilder; import javax.json.bind.JsonbConfig; import java.nio.file.Path; import static org.junit.jupiter.api.Assertions.assertEquals; public class PathAdapterTest { private static final String PATH = "/example/file.txt"; private static final Path P_PATH = Path.of(PATH); private static final Jsonb JSONB = JsonbBuilder.create(new JsonbConfig().withAdapters(new PathAdapter())); @Test public void testSerialize(){ assertEquals("\"" + PATH + "\"", JSONB.toJson(P_PATH)); } @Test public void testDeserialize(){ assertEquals(P_PATH, JSONB.fromJson("\"" + PATH + "\"", Path.class)); } }
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.example</groupId> <artifactId>jsonb-adapter-test</artifactId> <version>1.0-SNAPSHOT</version> <properties> <maven.compiler.source>11</maven.compiler.source> <maven.compiler.target>11</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>javax.json</groupId> <artifactId>javax.json-api</artifactId> <version>1.1.4</version> </dependency> <dependency> <groupId>javax.json.bind</groupId> <artifactId>javax.json.bind-api</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>org.apache.johnzon</groupId> <artifactId>johnzon-jsonb</artifactId> <version>1.2.3</version> </dependency> <!--<dependency> <groupId>org.eclipse</groupId> <artifactId>yasson</artifactId> <version>1.0.6</version> </dependency>--> <dependency> <groupId>org.junit.jupiter</groupId> <artifactId>junit-jupiter-api</artifactId> <version>5.6.1</version> <scope>test</scope> </dependency> </dependencies> </project>