diff --git a/utbot-framework/src/main/kotlin/org/utbot/engine/MockStrategy.kt b/utbot-framework/src/main/kotlin/org/utbot/engine/MockStrategy.kt
index 019a824e63..0b6694415c 100644
--- a/utbot-framework/src/main/kotlin/org/utbot/engine/MockStrategy.kt
+++ b/utbot-framework/src/main/kotlin/org/utbot/engine/MockStrategy.kt
@@ -47,7 +47,8 @@ private val systemPackages = setOf(
     "sun.misc",
     "jdk.internal",
     "kotlin.jvm.internal",
-    "kotlin.internal"
+    "kotlin.internal",
+    "javax"
 )
 
 private fun isSystemPackage(packageName: String): Boolean = systemPackages.any { packageName.startsWith(it) }
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