diff --git a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java17.groovy b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java17.groovy
index 75ae1b3188e..f5d7615846b 100644
--- a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java17.groovy
+++ b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java17.groovy
@@ -85,9 +85,11 @@ spec:
 
   stages {
       stage('Run tests'){
-          tools {
-              jdk 'openjdk-jdk17-latest'
-              ant 'apache-ant-latest'
+          environment {
+              // Declaring a jdk and ant the usual way in the 'tools' section, because of unknown reasons, breaks the usage of fundamental commands like xvnc, pkill and sh
+              JAVA_HOME = tool(type:'jdk', name:'openjdk-jdk17-latest')
+              ANT_HOME = tool(type:'ant', name:'apache-ant-latest')
+              PATH = "$JAVA_HOME/bin:$ANT_HOME/bin:$PATH"
           }
           steps {
               container ('custom'){
diff --git a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java21.groovy b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java21.groovy
index 068b5fc83e7..3710f2e0a81 100644
--- a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java21.groovy
+++ b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java21.groovy
@@ -85,9 +85,11 @@ spec:
 
   stages {
       stage('Run tests'){
-          tools {
-              jdk 'openjdk-jdk21-latest'
-              ant 'apache-ant-latest'
+          environment {
+              // Declaring a jdk and ant the usual way in the 'tools' section, because of unknown reasons, breaks the usage of fundamental commands like xvnc, pkill and sh
+              JAVA_HOME = tool(type:'jdk', name:'openjdk-jdk21-latest')
+              ANT_HOME = tool(type:'ant', name:'apache-ant-latest')
+              PATH = "$JAVA_HOME/bin:$ANT_HOME/bin:$PATH"
           }
           steps {
               container ('custom'){
diff --git a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java22.groovy b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java22.groovy
index 805be480190..7a29cad234a 100644
--- a/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java22.groovy
+++ b/JenkinsJobs/AutomatedTests/I_unit_cen64_gtk3_java22.groovy
@@ -85,9 +85,11 @@ spec:
 
   stages {
       stage('Run tests'){
-          tools {
-              jdk 'openjdk-jdk22-latest'
-              ant 'apache-ant-latest'
+          environment {
+              // Declaring a jdk and ant the usual way in the 'tools' section, because of unknown reasons, breaks the usage of fundamental commands like xvnc, pkill and sh
+              JAVA_HOME = tool(type:'jdk', name:'openjdk-jdk22-latest')
+              ANT_HOME = tool(type:'ant', name:'apache-ant-latest')
+              PATH = "$JAVA_HOME/bin:$ANT_HOME/bin:$PATH"
           }
           steps {
               container ('custom'){