diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 8222887..96ffd46 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -7,7 +7,7 @@ jobs:
   test:
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#choosing-github-hosted-runners
     runs-on: ${{ matrix.os }}
-    timeout-minutes: 5
+    timeout-minutes: 10
     name: fast test on OS ${{ matrix.os }}
     strategy:
       matrix:
diff --git a/.github/workflows/strong_ci.yaml b/.github/workflows/strong_ci.yaml
index abaa06d..91b54cf 100644
--- a/.github/workflows/strong_ci.yaml
+++ b/.github/workflows/strong_ci.yaml
@@ -7,7 +7,7 @@ jobs:
   test:
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#choosing-github-hosted-runners
     runs-on: ubuntu-latest
-    timeout-minutes: 10
+    timeout-minutes: 15
     name: test by multiply java versions
 
     steps:
diff --git a/hello-agent/src/main/java/io/foldright/study/hello/agent/HelloAgent.java b/hello-agent/src/main/java/io/foldright/study/hello/agent/HelloAgent.java
index a8a9909..5b9bfde 100644
--- a/hello-agent/src/main/java/io/foldright/study/hello/agent/HelloAgent.java
+++ b/hello-agent/src/main/java/io/foldright/study/hello/agent/HelloAgent.java
@@ -8,8 +8,8 @@
 import java.util.Collections;
 import java.util.List;
 
-import static io.foldright.study.agent.utils.transform.ThreadPoolExecutorTransformlet.THREAD_POOL_EXECUTOR_CLASS_NAME;
 import static io.foldright.study.agent.utils.Utils.isClassLoaded;
+import static io.foldright.study.agent.utils.transform.ThreadPoolExecutorTransformlet.THREAD_POOL_EXECUTOR_CLASS_NAME;
 
 
 /**
@@ -21,6 +21,10 @@ public class HelloAgent {
     public static void premain(final String agentArgs, @NonNull final Instrumentation inst) {
         System.out.println("[" + NAME + "Agent] Enter premain!");
 
+        if (System.getenv().containsKey("STUDY_HELLO_AGENT_THROW_EXCEPTION")) {
+            throw new IllegalStateException("throw exception for jvm start failure test by setting HELLO_AGENT_THROW_EXCEPTION env var!");
+        }
+
         if (isClassLoaded(inst, THREAD_POOL_EXECUTOR_CLASS_NAME))
             throw new IllegalStateException("class " + THREAD_POOL_EXECUTOR_CLASS_NAME + " already loaded");
 
diff --git a/scripts/integration_test.sh b/scripts/integration_test.sh
index 303d217..c839b40 100755
--- a/scripts/integration_test.sh
+++ b/scripts/integration_test.sh
@@ -67,6 +67,10 @@ for jdk_version in "${JDK_VERSIONS[@]}"; do
   # just test without build
   cu::head_line_echo "test with Java $jdk_version: $JAVA_HOME"
 
+  ##############################
+  # run unit test
+  ##############################
+
   # skip default jdk, already tested above
   if [ "$jdk_version" != "$default_build_jdk_version" ]; then
     # just test without build
@@ -83,9 +87,21 @@ for jdk_version in "${JDK_VERSIONS[@]}"; do
   cu::head_line_echo test under hello agent twice
   STUDY_AGENT_RUN_MODE=only-hello-agent-twice jvb::mvn_cmd ${CI_MORE_BEGIN_OPTS:-} dependency:properties surefire:test ${CI_MORE_END_OPTS:-}
 
+  ##############################
+  # run main test
+  ##############################
+
   cu::head_line_echo run Main without agents
   jvb::mvn_cmd dependency:properties exec:exec -pl main-runner
 
+  cu::head_line_echo "test jvm should fail if throw exception in agent premain"
+  tmp_output_file="target/study_hello_agent_throw_exception_$$_$RANDOM.tmp"
+  STUDY_HELLO_AGENT_THROW_EXCEPTION= STUDY_AGENT_RUN_MODE=only-hello-agent jvb::mvn_cmd dependency:properties exec:exec -pl main-runner 2>&1 |
+    tee "$tmp_output_file" &&
+    cu::die "jvm should fail if throw exception in agent premain!"
+  cu::log_then_run grep "IllegalStateException.*throw exception for jvm start failure test by setting HELLO_AGENT_THROW_EXCEPTION env var!" "$tmp_output_file" ||
+    cu::die "should contains exception message!"
+
   cu::head_line_echo run Main under hello and world agents
   STUDY_AGENT_RUN_MODE=hello-and-world-agents jvb::mvn_cmd dependency:properties exec:exec -pl main-runner
 
diff --git a/world-agent/src/main/java/io/foldright/study/world/agent/WorldAgent.java b/world-agent/src/main/java/io/foldright/study/world/agent/WorldAgent.java
index 4548613..d0c7927 100644
--- a/world-agent/src/main/java/io/foldright/study/world/agent/WorldAgent.java
+++ b/world-agent/src/main/java/io/foldright/study/world/agent/WorldAgent.java
@@ -8,8 +8,8 @@
 import java.util.Collections;
 import java.util.List;
 
-import static io.foldright.study.agent.utils.transform.ThreadPoolExecutorTransformlet.THREAD_POOL_EXECUTOR_CLASS_NAME;
 import static io.foldright.study.agent.utils.Utils.isClassLoaded;
+import static io.foldright.study.agent.utils.transform.ThreadPoolExecutorTransformlet.THREAD_POOL_EXECUTOR_CLASS_NAME;
 
 
 /**