我正在尝试将dsl-json与resteasy集成用于de / serialization。但它会引发异常
java.io.IOException: Unable to find reader for provided type: class com.x.y.api.v1.resource.A and fallback serialization is not registered.
17:04:51,705 ERROR [stderr] (default task-2) Found reader for: class com.x.y.api.v1.resource.A so try deserializing into that instead?
17:04:51,705 ERROR [stderr] (default task-2) Alternatively, try initializing system with custom fallback or register specified type using registerReader into class com.dslplatform.json.DslJson
17:04:51,705 ERROR [stderr] (default task-2) at com.dslplatform.json.DslJson.showErrorMessage(DslJson.java:650)
17:04:51,706 ERROR [stderr] (default task-2) at com.dslplatform.json.DslJson.deserialize(DslJson.java:980)
17:04:51,706 ERROR [stderr] (default task-2) at com.x.y.provider.DSLJsonProvider.readFrom(DSLJsonProvider.java:41)
17:04:51,706 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.readFrom(AbstractReaderInterceptorContext.java:61)
17:04:51,706 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.interception.ServerReaderInterceptorContext.readFrom(ServerReaderInterceptorContext.java:60)
17:04:51,706 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:53)
17:04:51,707 ERROR [stderr] (default task-2) at org.jboss.resteasy.security.doseta.DigitalVerificationInterceptor.aroundReadFrom(DigitalVerificationInterceptor.java:34)
17:04:51,707 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:55)
17:04:51,707 ERROR [stderr] (default task-2) at org.jboss.resteasy.plugins.interceptors.encoding.GZIPDecodingInterceptor.aroundReadFrom(GZIPDecodingInterceptor.java:59)
17:04:51,707 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.interception.AbstractReaderInterceptorContext.proceed(AbstractReaderInterceptorContext.java:55)
17:04:51,707 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:151)
17:04:51,708 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.MethodInjectorImpl.injectArguments(MethodInjectorImpl.java:91)
17:04:51,708 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:114)
17:04:51,708 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)
17:04:51,708 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)
17:04:51,708 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236)
17:04:51,709 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395)
17:04:51,709 ERROR [stderr] (default task-2) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:202)
17:04:51,709 ERROR [stderr] (default task-2) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)
17:04:51,710 ERROR [stderr] (default task-2) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
17:04:51,710 ERROR [stderr] (default task-2) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
我的DSLJsonProvider类看起来像这样。
package com.x.y.provider;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import com.dslplatform.json.DslJson;
import com.dslplatform.json.JsonReader;
import com.dslplatform.json.JsonReader.ReadObject;
import com.dslplatform.json.JsonWriter;
@SuppressWarnings("rawtypes")
@Provider
@Consumes({MediaType.APPLICATION_JSON, "text/json"})
@Produces({MediaType.APPLICATION_JSON, "text/json"})
public class DSLJsonProvider extends DslJson implements MessageBodyWriter, MessageBodyReader {
@Override
public boolean isReadable(Class type, Type genericType, Annotation[] annotations,
javax.ws.rs.core.MediaType mediaType) {
return true;
}
@SuppressWarnings("unchecked")
@Override
public Object readFrom(Class type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType,
MultivaluedMap httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
DslJson<Object> dslJson = new DslJson<Object>();
try {
dslJson.registerReader(type,null);//Here I need help
return dslJson.deserialize(type, entityStream, new byte[1024]);
} catch (Exception e) {
e.printStackTrace();
} finally {
entityStream.close();
}
return null;
}
@Override
public boolean isWriteable(Class type, Type genericType, Annotation[] annotations,
javax.ws.rs.core.MediaType mediaType) {
return true;
}
@Override
public long getSize(Object t, Class type, Type genericType, Annotation[] annotations,
javax.ws.rs.core.MediaType mediaType) {
return -1;
}
@Override
@SuppressWarnings("resource")
public void writeTo(Object t, Class type, Type genericType, Annotation[] annotations,
javax.ws.rs.core.MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream)
throws IOException, WebApplicationException {
JsonWriter writer = new JsonWriter();
try {
//Need help to register writer
writer.toStream(entityStream);
} catch (Exception e) {
e.printStackTrace();
}
}
}
编辑1： 我的pom.xml
<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>com.x.y</groupId>
<artifactId>project-web</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>project-web</name>
<dependencies>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-core</artifactId>
<version>1.3.20.Final</version>
</dependency>
<dependency>
<groupId>io.undertow</groupId>
<artifactId>undertow-servlet</artifactId>
<version>1.3.20.Final</version>
</dependency>
<dependency>
<groupId>com.dslplatform</groupId>
<artifactId>dsl-json</artifactId>
<version>0.9.5</version>
</dependency>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>3.0.16.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.3</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>3.0.16.Final</version>
</dependency>
<dependency>
<groupId>com.dslplatform</groupId>
<artifactId>dsl-json-java8</artifactId>
<version>0.9.7</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<annotationProcessors>
<annotationProcessor>com.dslplatform.json.CompiledJsonProcessor</annotationProcessor>
</annotationProcessors>
</configuration>
</plugin>
</plugins>
</build>
</project>
我在尝试注册读者和作家时有点受阻。任何领导都表示赞赏。
资源： dsl-json：https://github.com/ngs-doo/dsl-json
提前致谢。
答案 0 :(得分：0)
错误消息显示它无法找到：com.x.y.api.v1.resource.A
要么您忘记将@CompiledJson添加到该课程中，要么因为某些原因未将其ServiceLoader选中。{/ p>
如果你想为JsonReader.ReadObject注册你自己的阅读器，你可以查看geom readers，虽然我认为你可能只是想为编译器添加注释以便选择它。
这些注释的处理器存在于一个单独的库（处理器）中，所以很可能你没有包含它或将它作为注释处理器添加。
你需要摆脱dslJson.registerReader（type，null）;因为这将覆盖正确的读者。
我更新了dsl-json自述文件，因为我偶尔会遇到这样的错误。即：“在启动期间，DslJson通过ServiceLoader加载服务。为此，META-INF / services / com.dslplatform.json.Configuration必须与dsl_json.json.ExternalSerialization的内容一起存在，这是在编译步骤中创建的类。场景这个文件没有复制到APK或相应的jar / war文件。您可以通过在src / main / resources / META-INF / services下的项目中创建这样的文件来解决它，作为使用的包/构建工具的解决方法。“
我会对您的设置感兴趣，所以如果这样可以解决您的问题，请在存储库中提交一个问题，以便妥善解决。
答案 1 :(得分：0)
我遇到了同样的问题，并通过在反序列化类中添加默认构造函数进行了修复