Wiki source code of Changer de version de Java

Last modified by Aurelie Bertrand on 2025/10/09 14:40
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1 = Checking the current version =
2
3 There are two ways of checking the version currently used by tomcat :
4
5 * Open the** **page **[[Server status>>doc:Digdash.deployment.configuration.server_status.WebHome]]**: the Java version in use is indicated in the **Global** status section (in this example, Java 17).
6 [[image:Java_server_status_EN.png]]
7
8 * Check the version by going to the Java directory:
9 *1. In a terminal, enter the following command:
10
11 {{code language="shell"}}
12 cd /usr/lib/jvm
13 ll
14 {{/code}}
15
16 (% start="2" %)
17 1. Look at which version the default-java symbolic link is currently pointing to.
18 In the example below, it is pointing to java 11.
19 [[image:Check_java_version_FR.png||alt="Version java"]]
20
21 = Changing the Java version =
22
23 To change the Java version
24
25 1. Shut down tomcat:
26
27 {{code language="shell"}}
28 sudo service tomcat9 stop
29 {{/code}}
30
31 (% start="2" %)
32 1. Delete the symbolic link:
33
34 {{code language="shell"}}
35 sudo rm /usr/lib/jvm/default-java
36 {{/code}}
37
38 (% start="3" %)
39 1. Recreate the symbolic link to the desired version:
40
41 {{code language="shell"}}
42 # Change X java-1.1X to the desired version (here java 17)
43 sudo ln -s /usr/lib/jvm/java-1.17.0-openjdk-amd64 /usr/lib/jvm/default-java
44 {{/code}}
45
46 (% start="4" %)
47 1. Check that the link points to the desired version:
48
49 {{code}}
50 ll
51 {{/code}}
52
53 (% start="5" %)
54 1. Start tomcat:
55
56 {{code language="shell"}}
57 sudo service tomcat9 start
58 {{/code}}