Maven 构建：需要在构建前编辑 pom.xml

Question

我是 maven 的初学者，我正在尝试构建Signal CDS当我运行mvn package进行构建时，出现错误：

[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /home/t/Documents/ContactDiscoveryService/client/src/main/java/org/whispersystems/contactdiscovery/ContactDiscoveryClient.java:[13,63] cannot find symbol
  symbol:   class SignalContactDiscoveryUrl
  location: package org.whispersystems.signalservice.internal.configuration
[ERROR] /home/t/Documents/ContactDiscoveryService/client/src/main/java/org/whispersystems/contactdiscovery/ContactDiscoveryClient.java:[167,5] cannot find symbol
  symbol:   class SignalContactDiscoveryUrl
  location: class org.whispersystems.contactdiscovery.ContactDiscoveryClient
[ERROR] /home/t/Documents/ContactDiscoveryService/client/src/main/java/org/whispersystems/contactdiscovery/ContactDiscoveryClient.java:[167,57] cannot find symbol
  symbol:   class SignalContactDiscoveryUrl
  location: class org.whispersystems.contactdiscovery.ContactDiscoveryClient
[ERROR] /home/t/Documents/ContactDiscoveryService/client/src/main/java/org/whispersystems/contactdiscovery/ContactDiscoveryClient.java:[190,42] cannot find symbol
  symbol:   method getRegisteredUsers(java.security.KeyStore,java.util.Set<java.lang.String>,java.lang.String)
  location: variable serviceManager of type org.whispersystems.signalservice.api.SignalServiceAccountManager

当我使用 docker 构建时，我遇到了同样的错误。

但是当我编辑顶级pom.xml ，只需添加一个换行符或一个空格，它就成功了。

你能向我解释为什么会发生这种情况以及如何解决它

谢谢

编辑 1：我使用 maven 3.6.2 和 java 11

$ mvn -v
Apache Maven 3.6.2 (40f52333136460af0dc0d7232c0dc0bcf0d9e117; 2019-08-27T22:06:16+07:00)
Maven home: /home/t/Tools/apache-maven-3.6.2
Java version: 11.0.2, vendor: Oracle Corporation, runtime: /usr/lib/jvm/jdk-11.0.2
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.15.0-72-generic", arch: "amd64", family: "unix"

Answer 1

以下步骤在这里工作

$ git clone https://github.com/signalapp/ContactDiscoveryService.git

将client/pom.xml的依赖版本从2.7.8到2.9.0 。 因为类SignalContactDiscoveryUrl是在2.8.1版本之后引入的

<dependency>
    <groupId>org.whispersystems</groupId>
    <artifactId>signal-service-java</artifactId>
    <version>2.9.0</version>
</dependency>

用

$ cd ContactDiscoveryService
$ mvn package