1 files changed, 6 insertions, 10 deletions
diff --git a/poi-ooxml/build.gradle b/poi-ooxml/build.gradle
index 037dd59c05..e92d7e2534 100644
--- a/poi-ooxml/build.gradle
+++ b/poi-ooxml/build.gradle
@@ -180,9 +180,11 @@ task compileJava9(type: JavaCompile) {
     dependsOn 'compileJava', ':poi:jar'
 
     javaCompiler = javaToolchains.compilerFor {
-        languageVersion = JavaLanguageVersion.of(jdkVersion)
+        languageVersion = JavaLanguageVersion.of(Math.max(11, jdkVersion))
         if (jdkVendor != '') vendor = JvmVendorSpec.matching(jdkVendor)
     }
+    sourceCompatibility = 1.9
+    targetCompatibility = 1.9
     destinationDirectory = file(JAVA9_OUT + VERSIONS9)
     source = file(JAVA9_SRC)
     classpath = files()
@@ -190,10 +192,6 @@ task compileJava9(type: JavaCompile) {
         '--patch-module', "${MODULE_NAME}=${sourceSets.main.output.classesDirs.asPath}",
         '--module-path', files(MAIN_MODULE_PATH).asPath
     ]
-
-    onlyIf {
-        jdkVersion > 8
-    }
 }
 
 task cacheJava9(type: Copy) {
@@ -207,9 +205,11 @@ task compileTest9(type: JavaCompile) {
     dependsOn 'compileTestJava', ':poi:testJar'
 
     javaCompiler = javaToolchains.compilerFor {
-        languageVersion = JavaLanguageVersion.of(jdkVersion)
+        languageVersion = JavaLanguageVersion.of(Math.max(11, jdkVersion))
         if (jdkVendor != '') vendor = JvmVendorSpec.matching(jdkVendor)
     }
+    sourceCompatibility = 1.9
+    targetCompatibility = 1.9
     destinationDirectory = file(TEST9_OUT + VERSIONS9)
     source = file(TEST9_SRC)
     options.compilerArgs = [
@@ -217,10 +217,6 @@ task compileTest9(type: JavaCompile) {
         '--module-path', files(TEST_MODULE_PATH).asPath
     ]
     classpath = files()
-
-    onlyIf {
-        jdkVersion > 8
-    }
 }