The issue occurs due to one or more of the following causes. Check the error message and trouble and fix the issue based on the error message.

Potential cause 1 and solution

Error message

You can see more details in logs/config-center.log


You turned off the output in the script of the lightweight configuration center to reduce the number of standard output logs.

nohup $JAVA -Daddress.server.ip=$SERVER_IP -Dderby.system.home=../ -jar ../lib/edas-config-center.jar --logging.config=../conf/logback.xml >/dev/null 2>&1 &
Note The issue does not apply to startup.bat.


Make sure that JDK 1.8 or later is installed and is being used.

  1. Remove >/dev/null temporarily from the following code:
    #nohup $JAVA -Daddress.server.ip=$SERVER_IP -Dderby.system.home=../ -jar ../lib/edas-config-center.jar --logging.config=../conf/logback.xml >/dev/null 2>&1 &

    The preceding code is changed to the following code:

    #nohup $JAVA -Daddress.server.ip=$SERVER_IP -Dderby.system.home=../ -jar ../lib/edas-config-center.jar --logging.config=../conf/logback.xml  2>&1 &           
  2. Run ./ again.

    Then, a file named nohup.out is displayed in the current directory. The file contains the following log output:

    Exception in thread "main" java.lang.UnsupportedClassVersionError: com/alibaba/configcenter/ConfigCenterMain : Unsupported major.minor version 52.0

Potential cause 2 and solution

Error message

Unable to start embedded Tomcat servlet container
Tomcat connector in failed state


Check whether port 8080 is being used. If the port is used by another program, stop the program, and run the startup script again.

  • Windows
    1. Open Command Prompt, run the netstat -aon|findstr "8080" script, and record the number in the last column of the queried data PID (Process ID), for example, 2720.
    2. Run tasklist|findstr "2720". The program that is related to the current process ID (PID) is displayed, for example, javaw.exe.
    3. Run taskkill /PID 2720 /T /F.
    4. Start the lightweight configuration center again.
  • Linux
    1. Run netstat -antp|grep 8080. Then, the PID and program of the process that uses port 8080 appears, for example 2720.
    2. Run kill -9 2720.
    3. Start the lightweight configuration center again.

Potential cause 3 and solution

Error message

Caused by:


iZ25ax7xuf5Z indicates the current host name. Check whether the IP address and the name of the current host are specified in /etc/hosts. If not, specify the IP address and the name, for example, iZ25ax7xuf5Z.