我正在爲Windows和Linux系統生成安裝程序。在歡迎屏幕之後,我有一個CustomForm組件,用於獲取用戶詳細信息,然後使用javax.ws.rs.client.ClientBuilder
將它們發送到服務器。但在Windows中,當我的Class嘗試從ClientBuilder構建客戶端時,安裝程序將引發java.lang.LinkageError: ClassCastException
。整個日誌如下陳述:Install4j:顯示java.lang.LinkageError的Windows安裝程序:ClassCastException
java.lang.LinkageError: ClassCastException: attempting to cast
jar:file:/C:/Users/lutful.kabir/AppData/Local/Temp/e4j363A.tmp_dir1460795758/user/javaee-api-7.0.jar!/javax/ws/rs/client/ClientBuilder.class to
jar:file:/C:/Users/lutful.kabir/AppData/Local/Temp/e4j363A.tmp_dir1460795758/user/javaee-api-7.0.jar!/javax/ws/rs/client/ClientBuilder.class
at javax.ws.rs.client.ClientBuilder.newBuilder(ClientBuilder.java:97)
at javax.ws.rs.client.ClientBuilder.newClient(ClientBuilder.java:114)
at install4j.AuthorizationHandler.verifyAuthorization(AuthorizationHandler.java:21)
at install4j.backendsetup.VerifyBackend.install(VerifyBackend.java:27)
at com.install4j.runtime.installer.InstallerContextImpl$2.fetchValue(InstallerContextImpl.java:167)
at com.install4j.runtime.installer.InstallerContextImpl$2.fetchValue(InstallerContextImpl.java:164)
at com.install4j.runtime.installer.helper.comm.actions.FetchObjectAction.execute(FetchObjectAction.java:14)
at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionDirect(HelperCommunication.java:272)
at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionInt(HelperCommunication.java:247)
at com.install4j.runtime.installer.helper.comm.HelperCommunication.executeActionChecked(HelperCommunication.java:185)
at com.install4j.runtime.installer.helper.comm.HelperCommunication.fetchObjectChecked(HelperCommunication.java:168)
at com.install4j.runtime.installer.InstallerContextImpl.performActionIntStatic(InstallerContextImpl.java:164)
at com.install4j.runtime.installer.InstallerContextImpl.performActionInt(InstallerContextImpl.java:152)
at com.install4j.runtime.installer.ContextImpl.performAction(ContextImpl.java:1099)
at com.install4j.runtime.installer.controller.Controller.executeAction(Controller.java:367)
at com.install4j.runtime.installer.controller.Controller.executeActions(Controller.java:333)
at com.install4j.runtime.installer.controller.Controller.handleCommand(Controller.java:194)
at com.install4j.runtime.installer.controller.Controller.start(Controller.java:94)
at com.install4j.runtime.installer.Installer.runInProcess(Installer.java:59)
at com.install4j.runtime.installer.Installer.main(Installer.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:62)
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:101)
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:26)
爲AuthorizationHandler
的代碼如下:
package install4j;
import java.net.ConnectException;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Invocation;
import javax.ws.rs.client.Invocation.Builder;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import com.install4j.api.Util;
import com.install4j.api.context.InstallerContext;
import installerconfigparams.utils.InstallerParameter;
public class AuthorizationHandler {
public static boolean verifyAuthorization(String authToken, InstallerContext context) throws ConnectException {
Client client = ClientBuilder.newClient();
WebTarget target = client.target(InstallerParameter.CENTRAL_SERVER_URL.getStringValue())
.path(InstallerParameter.PATH_BACKEND_VERIFICATION.getStringValue());
Builder builder = target.request(MediaType.APPLICATION_JSON);
builder.header(InstallerParameter.AUTHORIZATION_HEADER.getStringValue(), authToken);
Invocation invocation = builder.buildGet();
Response response;
response = invocation.invoke();
response.getStringHeaders();
int status = response.getStatus();
if (InstallerParameter.HTTP_200.getIntValue() != status) {
String args = response.getHeaderString("error");
Util.showErrorMessage(context.getMessage("installer.backend.login.invalid") + args);
return false;
}
Util.showMessage(context.getMessage("installer.backend.login.successful"));
return true;
}
現在,據我所知,並根據我的互聯網研究,這可能發生時,有可能是重複的資源(從日誌中,您還可以看到它正在使用的ClientBuilder
類也來自相同的路徑)。我已確認沒有添加重複的jar文件,以便安裝程序可以將其混淆。我對ClassLoaders或Install4j的工作原理並不熟悉。我也嘗試使用Run Script
行動,直接在那裏寫代碼,但最終有相同的例外。
我一直在使用相同的類和方法,因爲我一直在構建安裝程序。直到今天沒有任何問題。我甚至在我遇到這個問題之前檢查了我的舊委員會。但結果是一樣的。而這個問題只發生在Windows中的安裝程序。
它可能是一個上下文類加載器的問題?嘗試在方法的頂部添加'Thread.currentThread()。setContextClassLoader(getClass()。getClassLoader());'。 –
哇!它起作用,至少在我的本地機器上。你能否詳細解答我的問題? – ShaDooW