尝试在 Errai 4 中进行 JAXRS 调用时出现 ClassCastException
ClassCastException When Trying to Make JAXRS Call in Errai 4
我正在使用 Errai 4.0.0.Beta1，我正在尝试进行简单的 JAX RS 调用。
这是我使用的代码：
final RemoteCallback<List<Company>> remoteCallback = new RemoteCallback<List<Company>>() {
@Override
public void callback(List<Company> companies) {
Window.alert("rpcServiceCaller - Callback");
Window.alert("Number of companies returned: " + companies.size());
}
};
final RestErrorCallback errorCallback = new RestErrorCallback() {
@Override
public boolean error(Request message, Throwable throwable) {
Window.alert(throwable.getMessage());
logger.error(throwable.getMessage(), throwable);
return false;
}
};
RestClient.create(ErraiJAXRSService.class,
remoteCallback,
errorCallback,
200).getCompaniesJSON();
我在超级开发模式中看到以下异常：
Error caused by: ClassCastException: undefined
at f9b_g$ [as collect_0_g$] (StackTraceCreator.java:198)
at H8b_g$ (StackTraceCreator.java:343)
at Iz_g$ [as fillInStackTrace_0_g$] (Throwable.java:114)
at Bz_g$ (Throwable.java:53)
at Xz_g$ (Exception.java:25)
at cA_g$ (RuntimeException.java:25)
at Ymb_g$ (ClassCastException.java:23)
at Mzg_g$ (InternalPreconditions.java:45)
at Xzg_g$ (InternalPreconditions.java:33)
at n1d_g$ (Cast.java:75)
at rrh_g$ (RestClient.java:192)
at srh_g$ (RestClient.java:158)
at wrh_g$ (RestClient.java:113)
at ynf_g$ [as erraiJSON_0_g$] (JAXRSPage.java:94)
at gKh_g$ [as onClick_0_g$] (Type_factory__c_i_e_c_j_JAXRSPage__quals__j_e_i_Any_j_e_i_Default.java:76)
at Exd_g$ [as dispatch_4_g$] (ClickEvent.java:56)
at Fxd_g$ [as dispatch_1_g$] (ClickEvent.java:55)
at Awd_g$ [as dispatch_0_g$] (GwtEvent.java:76)
at ZGd_g$ (EventBus.java:40)
at iHd_g$ [as doFire_0_g$] (SimpleEventBus.java:193)
at oHd_g$ [as fireEvent_2_g$] (SimpleEventBus.java:88)
at RGd_g$ [as fireEvent_1_g$] (HandlerManager.java:127)
at Lve_g$ [as fireEvent_1_g$] (Widget.java:129)
at Lwd_g$ (DomEvent.java:125)
at Tve_g$ [as onBrowserEvent_0_g$] (Widget.java:177)
at gne_g$ (DOM.java:1480)
at fne_g$ (DOM.java:1419)
at HTMLButtonElement.xte_g$ (DOMImplStandard.java:317)
at k6b_g$ (Impl.java:233)
at n6b_g$ (Impl.java:285)
at HTMLButtonElement.<anonymous> (Impl.java:71)
代理已返回，但任何试图将其转换为 AbstractJaxrsProxy 的行都失败并出现上述异常。
已创建 JaxrsProxyLoaderImpl.java，我的 JAX RS 服务就在那里：
package org.jboss.errai.enterprise.client.jaxrs;
import com.google.gwt.http.client.RequestBuilder;
import com.insclix.erraiPOC.shared.domain.Company;
import com.insclix.erraiPOC.shared.service.jaxrs.ErraiJAXRSService;
import java.util.List;
import org.jboss.errai.common.client.api.ErrorCallback;
import org.jboss.errai.common.client.api.RemoteCallback;
import org.jboss.errai.common.client.framework.ProxyProvider;
import org.jboss.errai.common.client.framework.RemoteServiceProxyFactory;
import org.jboss.errai.security.client.local.interceptors.SecurityExceptionMapper;
public class JaxrsProxyLoaderImpl implements JaxrsProxyLoader { public void loadProxies() {
class com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl extends AbstractJaxrsProxy implements ErraiJAXRSService {
private RemoteCallback remoteCallback;
private ErrorCallback errorCallback;
public com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl() {
setExceptionMapper(new SecurityExceptionMapper());
}
public RemoteCallback getRemoteCallback() {
return remoteCallback;
}
public void setRemoteCallback(RemoteCallback callback) {
remoteCallback = callback;
}
public ErrorCallback getErrorCallback() {
return errorCallback;
}
public void setErrorCallback(ErrorCallback callback) {
errorCallback = callback;
}
public List getCompaniesJSON() {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url.toString());
requestBuilder.setHeader("Accept", "application/json");
sendRequest(requestBuilder, null, new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, List.class, Company.class);
}
});
return null;
}
public List getCompaniesXML() {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url.toString());
requestBuilder.setHeader("Accept", "application/xml");
sendRequest(requestBuilder, null, new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, List.class, Company.class);
}
});
return null;
}
public Long createCompanyJSON(final Company a0) {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, url.toString());
requestBuilder.setHeader("Content-Type", "application/json");
sendRequest(requestBuilder, MarshallingWrapper.toJSON(a0), new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, Long.class, null);
}
});
return 0L;
}
public Long createCompanyXML(final Company a0) {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, url.toString());
requestBuilder.setHeader("Content-Type", "application/xml");
sendRequest(requestBuilder, MarshallingWrapper.toJSON(a0), new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, Long.class, null);
}
});
return 0L;
}
}
RemoteServiceProxyFactory.addRemoteProxy(ErraiJAXRSService.class, new ProxyProvider() {
public Object getProxy() {
return new com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl();
}
});
}
}
事实证明这是 JAX-RS/Errai class 和接口配置方式的问题。根据 JAX-RS 规范，@Path 注释需要在实现上，但 Errai 需要在接口上。
因此，解决方案是在接口（对于 Errai）和实现它的 class（对于 JAX-RS）上都使用 @Path 注释。
注意，如果注解在接口上，Wildfly 允许这样做，Jersey 忽略接口，Resteasy 失败（如果 运行 通过 ResteasyServletInitializer。
我正在使用 Errai 4.0.0.Beta1，我正在尝试进行简单的 JAX RS 调用。
这是我使用的代码：
final RemoteCallback<List<Company>> remoteCallback = new RemoteCallback<List<Company>>() {
@Override
public void callback(List<Company> companies) {
Window.alert("rpcServiceCaller - Callback");
Window.alert("Number of companies returned: " + companies.size());
}
};
final RestErrorCallback errorCallback = new RestErrorCallback() {
@Override
public boolean error(Request message, Throwable throwable) {
Window.alert(throwable.getMessage());
logger.error(throwable.getMessage(), throwable);
return false;
}
};
RestClient.create(ErraiJAXRSService.class,
remoteCallback,
errorCallback,
200).getCompaniesJSON();
我在超级开发模式中看到以下异常：
Error caused by: ClassCastException: undefined
at f9b_g$ [as collect_0_g$] (StackTraceCreator.java:198)
at H8b_g$ (StackTraceCreator.java:343)
at Iz_g$ [as fillInStackTrace_0_g$] (Throwable.java:114)
at Bz_g$ (Throwable.java:53)
at Xz_g$ (Exception.java:25)
at cA_g$ (RuntimeException.java:25)
at Ymb_g$ (ClassCastException.java:23)
at Mzg_g$ (InternalPreconditions.java:45)
at Xzg_g$ (InternalPreconditions.java:33)
at n1d_g$ (Cast.java:75)
at rrh_g$ (RestClient.java:192)
at srh_g$ (RestClient.java:158)
at wrh_g$ (RestClient.java:113)
at ynf_g$ [as erraiJSON_0_g$] (JAXRSPage.java:94)
at gKh_g$ [as onClick_0_g$] (Type_factory__c_i_e_c_j_JAXRSPage__quals__j_e_i_Any_j_e_i_Default.java:76)
at Exd_g$ [as dispatch_4_g$] (ClickEvent.java:56)
at Fxd_g$ [as dispatch_1_g$] (ClickEvent.java:55)
at Awd_g$ [as dispatch_0_g$] (GwtEvent.java:76)
at ZGd_g$ (EventBus.java:40)
at iHd_g$ [as doFire_0_g$] (SimpleEventBus.java:193)
at oHd_g$ [as fireEvent_2_g$] (SimpleEventBus.java:88)
at RGd_g$ [as fireEvent_1_g$] (HandlerManager.java:127)
at Lve_g$ [as fireEvent_1_g$] (Widget.java:129)
at Lwd_g$ (DomEvent.java:125)
at Tve_g$ [as onBrowserEvent_0_g$] (Widget.java:177)
at gne_g$ (DOM.java:1480)
at fne_g$ (DOM.java:1419)
at HTMLButtonElement.xte_g$ (DOMImplStandard.java:317)
at k6b_g$ (Impl.java:233)
at n6b_g$ (Impl.java:285)
at HTMLButtonElement.<anonymous> (Impl.java:71)
代理已返回，但任何试图将其转换为 AbstractJaxrsProxy 的行都失败并出现上述异常。
已创建 JaxrsProxyLoaderImpl.java，我的 JAX RS 服务就在那里：
package org.jboss.errai.enterprise.client.jaxrs;
import com.google.gwt.http.client.RequestBuilder;
import com.insclix.erraiPOC.shared.domain.Company;
import com.insclix.erraiPOC.shared.service.jaxrs.ErraiJAXRSService;
import java.util.List;
import org.jboss.errai.common.client.api.ErrorCallback;
import org.jboss.errai.common.client.api.RemoteCallback;
import org.jboss.errai.common.client.framework.ProxyProvider;
import org.jboss.errai.common.client.framework.RemoteServiceProxyFactory;
import org.jboss.errai.security.client.local.interceptors.SecurityExceptionMapper;
public class JaxrsProxyLoaderImpl implements JaxrsProxyLoader { public void loadProxies() {
class com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl extends AbstractJaxrsProxy implements ErraiJAXRSService {
private RemoteCallback remoteCallback;
private ErrorCallback errorCallback;
public com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl() {
setExceptionMapper(new SecurityExceptionMapper());
}
public RemoteCallback getRemoteCallback() {
return remoteCallback;
}
public void setRemoteCallback(RemoteCallback callback) {
remoteCallback = callback;
}
public ErrorCallback getErrorCallback() {
return errorCallback;
}
public void setErrorCallback(ErrorCallback callback) {
errorCallback = callback;
}
public List getCompaniesJSON() {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url.toString());
requestBuilder.setHeader("Accept", "application/json");
sendRequest(requestBuilder, null, new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, List.class, Company.class);
}
});
return null;
}
public List getCompaniesXML() {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.GET, url.toString());
requestBuilder.setHeader("Accept", "application/xml");
sendRequest(requestBuilder, null, new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, List.class, Company.class);
}
});
return null;
}
public Long createCompanyJSON(final Company a0) {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, url.toString());
requestBuilder.setHeader("Content-Type", "application/json");
sendRequest(requestBuilder, MarshallingWrapper.toJSON(a0), new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, Long.class, null);
}
});
return 0L;
}
public Long createCompanyXML(final Company a0) {
StringBuilder url = new StringBuilder(getBaseUrl());
url.append("company/jaxrs");
RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, url.toString());
requestBuilder.setHeader("Content-Type", "application/xml");
sendRequest(requestBuilder, MarshallingWrapper.toJSON(a0), new ResponseDemarshallingCallback() {
public Object demarshallResponse(String response) {
return MarshallingWrapper.fromJSON(response, Long.class, null);
}
});
return 0L;
}
}
RemoteServiceProxyFactory.addRemoteProxy(ErraiJAXRSService.class, new ProxyProvider() {
public Object getProxy() {
return new com_insclix_erraiPOC_shared_service_jaxrs_ErraiJAXRSServiceImpl();
}
});
}
}
事实证明这是 JAX-RS/Errai class 和接口配置方式的问题。根据 JAX-RS 规范，@Path 注释需要在实现上，但 Errai 需要在接口上。
因此，解决方案是在接口（对于 Errai）和实现它的 class（对于 JAX-RS）上都使用 @Path 注释。
注意，如果注解在接口上，Wildfly 允许这样做，Jersey 忽略接口，Resteasy 失败（如果 运行 通过 ResteasyServletInitializer。