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Running my springboot web service java jar app on ubuntu server results in the error shown below, I have done a bit of research about the error however I cannot get a solution. The command I am using to run the jar file is

java -jar mySpringBootApp.jar
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to create tempDir. java.io.tmpdir is set to /tmp
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:157) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540) ~[spring-context-5.1.3.RELEASE.jar!/:5.1.3.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at aacctt.payments.org.Application.main(Application.java:18) [classes!/:0.0.1-SNAPSHOT]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_191]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_191]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_191]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_191]
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [ mySpringBootApp-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [ mySpringBootApp-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [ mySpringBootApp-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) [ mySpringBootApp-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to create tempDir. java.io.tmpdir is set to /tmp
    at org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir(AbstractConfigurableWebServerFactory.java:182) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:162) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    ... 16 common frames omitted
Caused by: java.io.IOException: Read-only file system
    at java.io.UnixFileSystem.createFileExclusively(Native Method) ~[na:1.8.0_191]
    at java.io.File.createTempFile(File.java:2024) ~[na:1.8.0_191]
    at java.io.File.createTempFile(File.java:2070) ~[na:1.8.0_191]
    at org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir(AbstractConfigurableWebServerFactory.java:173) ~[spring-boot-2.1.1.RELEASE.jar!/:2.1.1.RELEASE]
    ... 19 common frames omitted
                Either give permissions to the user to write to tmp or change the tmp directory with the jvm option -Djava.io.tmpdir=<some dir with rw privileges>.
– Nord
                Feb 18, 2020 at 1:02
In case you are getting this issue while deploying Spring boot application in Kubernetes, one of configuration worth checking is readOnlyRootFilesystem. It must be set to false until you are trying to intentionally run read only containers.
It can be used in deployment config as following:
template:
    metadata:
      labels:
        app: hello
    spec:
      containers:
      - name: hello
        image: hello-world
        securityContext:
          runAsUser: 1000
          readOnlyRootFilesystem: false ## this should not be true
1) Change permissions of /tmp to give access to your user.
chmod -R 777 /tmp
make you sure you run above command with sudo access (root)
2) add the user who is to the sudo group. 
For ones who are getting same exception while running from Intellij IDEA when providing env variables as part of run/debug configuration:
please look if "Include parent environment variables" is checked
                at first try if you really don't have permissions... command like touch /tmp/testfile.txt could give you a result. If it tells you that you don't have permissions try chmod 1777 /tmp
– bilak
                Nov 21, 2019 at 18:24
                I get this error when I run the first command ``` touch: cannot touch '/tmp/testfile.txt': Read-only file system ```
– Erent
                Nov 21, 2019 at 18:28
                and when I run the last command I get chmod: changing permissions of '/tmp': Read-only file system
– Erent
                Nov 21, 2019 at 18:29
One reason for this error is that you not include system environments variables. Maybe you try to define a new configuration with different system variables that are defined in your java IDE and you disable default environments variable.
Please enable checkbox:
Run/Debug Configuration -> select your configuration -> press on the environment variables -> check Include system environment variables (as in the picture added above).
Keep in mind that you need to check if you have added the path of the Temp file in the system variables.
        
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