为什么这些 application.properties 不起作用？

如何解决为什么这些 application.properties 不起作用？

我一直在实现一个简单的 quarkus 应用程序，用于创建与 Alfresco 一起使用的 CMIS API。关注this tutorial（只是为了提供一点见解）

一切都很顺利，直到我决定使用属性来传递会话参数。我已将它们添加到 main/resources/application.properties 中的 application.properties 中，如下所示：

# Session properties
session.host=localhost
session.port=80
session.url=http://localhost:80/alfresco/api/-default-/cmis/versions/1.1/atom
session.compression=true
session.cache_ttl_objects=0

然后我尝试直接在我使用它们的类中定义它们，但由于得到了空值，我四处寻找为什么会发生这种情况并找到了 this。话虽如此，我遵循了应该解决这个问题的 this 结构。

我创建了类 SessionConfig.java：

package com.c4pa.cmisservice;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

import org.eclipse.microprofile.config.inject.ConfigProperty;

import io.quarkus.arc.config.ConfigProperties;

@ConfigProperties(prefix = "session") // Already tried without this,using session.url,etc on each Property
public class SessionConfig {

    @Inject // Already tried without this
    @ConfigProperty(name = "url")
    private String url;

    @Inject // Already tried without this
    @ConfigProperty(name = "compression",defaultValue = "true")
    private String compression;

    @Inject // Already tried without this
    @ConfigProperty(name = "cache_ttl_objects",defaultValue = "0")
    private String cacheTTLObjects;

    public String getUrl(){
        return this.url;
    }

    public void setUrl(String url){
        this.url = url;
    }

    public String getCompression(){
        return this.compression;
    }

    public void setCompression(String compression){
        this.compression = compression;
    }

    public String getCacheTTLObjects(){
        return this.cacheTTLObjects;
    }

    public void setCacheTTLObjects(String cacheTTLObjects){
        this.cacheTTLObjects = cacheTTLObjects;
    }

}

我正在尝试使用此类 CMISClient.java 上的属性：

@ApplicationScoped
public class CMISClient {

    private static Map<String,Session> connections = new ConcurrentHashMap<String,Session>();

    public CMISClient() { }

    @Inject
    SessionConfig sessionConfig;

    public Session getSession(String connectionName,String username,String pwd) {
        Session session = connections.get(connectionName);
        System.out.println(sessionConfig.getUrl() + "|" + sessionConfig.getCompression() + "|" + sessionConfig.getCacheTTLObjects());
        if (session == null) {
            // No connection to Alfresco available,creating a new one
            SessionFactory sessionFactory = SessionFactoryImpl.newInstance();
            Map<String,String> parameters = new HashMap<String,String>();
            parameters.put(SessionParameter.USER,username);
            parameters.put(SessionParameter.PASSWORD,pwd);
            parameters.put(SessionParameter.ATOmpuB_URL,sessionConfig.getUrl());
            parameters.put(SessionParameter.BINDING_TYPE,BindingType.ATOmpuB.value());
            parameters.put(SessionParameter.COMPRESSION,sessionConfig.getCompression());
            parameters.put(SessionParameter.CACHE_TTL_OBJECTS,sessionConfig.getCacheTTLObjects());
            ...
        }
        return session;
    }
...
}

但是当我调用调用 getSession 方法的端点时，它会在 getSession 方法的 println 上导致 org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException。当然，如果我对此发表评论，我将在 parameters.put 行上得到相同的异常。

反向堆栈跟踪（如果有用）：

java.lang.NullPointerException
    at com.c4pa.cmisservice.CMISClient.getSession(CMISClient.java:46)
    at com.c4pa.cmisservice.CMISResource.createConnection(CMISResource.java:42)
    at com.c4pa.cmisservice.CMISResource.send(CMISResource.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.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:170)
    at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:130)
    at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:643)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:507)
    at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:457)
    at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:459)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:419)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:393)
    at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:68)
    at org.jboss.resteasy.core.Synchronousdispatcher.invoke(Synchronousdispatcher.java:492)
    at org.jboss.resteasy.core.Synchronousdispatcher.lambda$invoke$4(Synchronousdispatcher.java:261)
    at org.jboss.resteasy.core.Synchronousdispatcher.lambda$preprocess$0(Synchronousdispatcher.java:161)
    at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
    at org.jboss.resteasy.core.Synchronousdispatcher.preprocess(Synchronousdispatcher.java:164)
    at org.jboss.resteasy.core.Synchronousdispatcher.invoke(Synchronousdispatcher.java:247)
    at io.quarkus.resteasy.runtime.standalone.Requestdispatcher.service(Requestdispatcher.java:73)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.dispatch(VertxRequestHandler.java:136)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.access$000(VertxRequestHandler.java:40)
    at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler$1.run(VertxRequestHandler.java:97)
    at io.quarkus.runtime.CleanableExecutor$CleaningRunnable.run(CleanableExecutor.java:231)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2046)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1578)
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1452)
    at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
    at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
    at java.base/java.lang.Thread.run(Thread.java:834)
    at org.jboss.threads.JBossthread.run(JBossthread.java:479)
Resulted in: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
    at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:106)
    at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:372)
    at org.jboss.resteasy.core.Synchronousdispatcher.writeException(Synchronousdispatcher.java:218)
    at org.jboss.resteasy.core.Synchronousdispatcher.invoke(Synchronousdispatcher.java:519)
    ... 20 more

关于为什么会发生这种情况的任何想法？非常感谢。

编辑：

@Path("/file")
public class CMISResource {

    private CMISClient cmisClient;
    private String connectionName;
    private Session session;

    @GET
    @Path("/send")
    @Produces(MediaType.TEXT_PLAIN)
    public String send() throws IOException {
        this.createConnection();
        Folder folder = this.cmisClient.createFolder(session);
        Document document = cmisClient.createDocument(session,folder);
        return document.getName() + " was succesfully created (at least I hope so)";
    }

    private void createConnection() {
        this.cmisClient = new CMISClient();
        this.connectionName = "c4paAlf01";
        this.session = cmisClient.getSession(connectionName,"username","password");
    }

解决方法

试试这个：

@ConfigProperties(prefix = "session")
public class SessionConfig {

  public String url;
  public String compression;
  public String cacheTTLObjects;
}