diff --git a/cloudapi-common/build.gradle.kts b/cloudapi-common/build.gradle.kts
index 40be325..cc0e175 100644
--- a/cloudapi-common/build.gradle.kts
+++ b/cloudapi-common/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
     id("java")
 
@@ -63,8 +65,17 @@ dependencies {
     testImplementation("org.junit.jupiter:junit-jupiter:5.8.1")
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.1")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.1")
+    implementation(kotlin("stdlib-jdk8"))
 }
 
 tasks.getByName<Test>("test") {
     useJUnitPlatform()
 }
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
\ No newline at end of file
diff --git a/cloudapi-model/build.gradle.kts b/cloudapi-model/build.gradle.kts
index 98e7420..2b70739 100644
--- a/cloudapi-model/build.gradle.kts
+++ b/cloudapi-model/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
     id("java")
     kotlin("jvm")
@@ -20,8 +22,17 @@ dependencies {
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.1")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.1")
+    implementation(kotlin("stdlib-jdk8"))
 }
 
 tasks.getByName<Test>("test") {
     useJUnitPlatform()
 }
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
\ No newline at end of file
diff --git a/cloudapi-web/build.gradle.kts b/cloudapi-web/build.gradle.kts
index cbf338b..65368bb 100644
--- a/cloudapi-web/build.gradle.kts
+++ b/cloudapi-web/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 val kotlin_version: String by project
 
 plugins {
@@ -81,6 +83,7 @@ dependencies {
 
     // test
     testImplementation("org.jetbrains.kotlin:kotlin-test:$kotlin_version")
+    implementation(kotlin("stdlib-jdk8"))
 }
 
 tasks {
@@ -99,3 +102,11 @@ tasks {
         useJUnitPlatform()
     }
 }
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
\ No newline at end of file
diff --git a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/service/Auth.kt b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/service/Auth.kt
index 1b5685c..6e73863 100644
--- a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/service/Auth.kt
+++ b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/service/Auth.kt
@@ -136,7 +136,7 @@ class AuthService(val call: ApplicationCall) : IService {
 
     private suspend fun afterLogin(token: String, user: User): LoginUserResponse {
         if (user.paasToken.isBlank()) {
-            call.project.createUser(user.id)
+//            call.project.createUser(user.id)
         }
 
         // insert token in redis (just for compatibility with older platforms)
@@ -291,7 +291,7 @@ class AuthService(val call: ApplicationCall) : IService {
         user.acceptTime = System.currentTimeMillis().toString()
         user.flushChanges()
 
-        call.project.createUser(user)
+//        call.project.createUser(user)
 
         return afterLogin(generateRSAToken(user.id), user)
     }
diff --git a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/vm/vcenter/VCenterClient.kt b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/vm/vcenter/VCenterClient.kt
index dc2bffe..b1cff89 100644
--- a/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/vm/vcenter/VCenterClient.kt
+++ b/cloudapi-web/src/main/kotlin/cn/edu/buaa/scs/vm/vcenter/VCenterClient.kt
@@ -21,6 +21,8 @@ import org.ktorm.dsl.and
 import org.ktorm.dsl.eq
 import org.ktorm.entity.find
 import org.ktorm.jackson.KtormModule
+import java.security.cert.X509Certificate
+import javax.net.ssl.X509TrustManager
 
 object VCenterClient : IVMClient {
 
@@ -38,6 +40,15 @@ object VCenterClient : IVMClient {
                 install(HttpTimeout) {
                     requestTimeoutMillis = 10000L
                 }
+                engine {
+                    https {
+                        trustManager = object : X509TrustManager {
+                            override fun getAcceptedIssuers(): Array<X509Certificate> = arrayOf()
+                            override fun checkClientTrusted(chain: Array<X509Certificate>, authType: String) {}
+                            override fun checkServerTrusted(chain: Array<X509Certificate>, authType: String) {}
+                        }
+                    }
+                }
             },
             basePath = globalConfig.vcenter.serviceUrl
         )
diff --git a/vcenter/build.gradle.kts b/vcenter/build.gradle.kts
index b4a53e6..13a1f31 100644
--- a/vcenter/build.gradle.kts
+++ b/vcenter/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
     id("java")
     application
@@ -37,6 +39,7 @@ dependencies {
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.1")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.1")
+    implementation(kotlin("stdlib-jdk8"))
 }
 
 tasks {
@@ -55,3 +58,11 @@ tasks {
         useJUnitPlatform()
     }
 }
+val compileKotlin: KotlinCompile by tasks
+compileKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
+val compileTestKotlin: KotlinCompile by tasks
+compileTestKotlin.kotlinOptions {
+    jvmTarget = "1.8"
+}
\ No newline at end of file