Intellij、Postman 和 curl - 无法识别端口 8080 上的 localhost

我在 Scala 中有一个简单的休息服务器。通过 intellij 运行这个项目localhost:8080。我试图通过邮递员和 curl 向该服务器发送POST或GET请求，但它无法连接它，不知道为什么。我 ping 了 localhost 并且它回答了，但是应用程序运行的 localhost:8080 仅加载，仅此而已。我运行 intellij 并启动我的服务器（scala、cats、Blaze）。昨天一切正常，但今天却不行。我查看了 intellij 日志，它们看起来不错：

2019-04-21 19:29:08,912 [14101080]   INFO - ij.compiler.impl.CompileDriver - COMPILATION STARTED (BUILD PROCESS) 
2019-04-21 19:29:08,919 [14101087]   INFO - j.compiler.server.BuildManager - Using preloaded build process to compile /home/project 
2019-04-21 19:29:11,565 [14103733]   INFO - lij.compiler.impl.CompilerUtil -    COMPILATION FINISHED (BUILD PROCESS); Errors: 0; warnings: 0 took 2662 ms: 0 min 2sec 
2019-04-21 19:29:11,565 [14103733]   INFO - s.CompilerReferenceServiceBase - backward reference index reader doesn't exist 
2019-04-21 19:29:12,358 [14104526]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stdout]: Build process started. Classpath: /home/intellij/idea-IU-183.5912.21/lib/jps-launcher.jar:/usr/lib/jvm/java-1.11.0-openjdk-amd64/lib/tools.jar:/home/intellij/idea-IU-183.5912.21/lib/optimizedFileManager.jar 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Defaulting to no-operation (NOP) logger implementation 
2019-04-21 19:29:12,419 [14104587]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: An illegal reflective access operation has occurred 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Illegal reflective access by com.google.protobuf.UnsafeUtil (file:/home/intellij/idea-IU-183.5912.21/lib/protobuf-java-3.4.0.jar) to field java.nio.Buffer.address 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Please consider reporting this to the maintainers of com.google.protobuf.UnsafeUtil 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations 
2019-04-21 19:29:14,496 [14106664]   INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: All illegal access operations will be denied in a future release 

一切都很好。我不知道问题可能出在哪里。我也尝试在邮递员中打开代理，但没有帮助。清除了intellij中的缓存，没有任何帮助。我正在使用最新的 Ubuntu。有没有人有同样的问题并且知道如何解决它？也许这是一个愚蠢的问题，但我真的不知道会发生什么。

编辑8080我用这个命令 检查了是否有其他东西使用端口： netstat -tulpn | grep 8080，但我只得到一个结果：

tcp6 0 0 127.0.0.1:8080 :::*LISTEN 18125/java. 看起来只有我正在运行的应用程序正在使用此端口。