I ran a java project but got the above error. Please help me resolve it. Here is the log of console windows and the content of error:

HTTP ERROR 503 Service Unavailable URI: /PES/ STATUS: 503 MESSAGE: Service Unavailable SERVLET: - Powered by Jetty:// 10.0.6

Starting preview server on port 8080

Modules: PES (/PES)

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.