'Unable to create tempDir. java.io.tmpdir is set to /tmp

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
javaspringspring-bootjar


Solution 1:[1]

Try any of the following:

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.

Solution 2:[2]

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

Solution 3:[3]

your application user probably does not have sufficient permissions to crate anything in /tmp directory ... see last message Caused by: java.io.IOException: Read-only file system

Solution 4:[4]

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

Solution 5:[5]

The most likely explanation for this is that the root filesystem is full. It was the issue for me.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Dilip G
Solution 2 Daniel
Solution 3 bilak
Solution 4 Sukhmeet Sethi
Solution 5 MikeKulls

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