在将项目部署到appengine时出现错误。 当我在本地运行这个应用程序时，它运行正常，但当我尝试将其部署到appengine时，我收到以下错误。有人可以在这帮忙吗？
[INFO] GCLOUD: ERROR: (gcloud.app.deploy) Error Response: [9]
[INFO] GCLOUD: Application startup error:
[INFO] GCLOUD: Start command: java -showversion -
agentpath:/opt/cdbg/cdbg_java_agent.so=--log_dir=/var/log/app_engine,--
alsologtostderr=true -Xms2048M -Xmx2048M -XX:+UseG1GC -
XX:+ParallelRefProcEnabled -XX:+PrintCommandLineFlags -jar app.jar
[INFO] GCLOUD: -XX:InitialHeapSize=514850816 -XX:MaxHeapSize=514850816 -
XX:+ParallelRefProcEnabled -XX:+PrintCommandLineFlags -
XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG1GC
[INFO] GCLOUD: I0707 20:55:24.233410 25 jvmti_globals.cc:352] Build time:
Jun 22 2017 16:09:00
[INFO] GCLOUD: I0707 20:55:24.239876 25 jvmti_agent.cc:158] Java debuglet
initialization started
[INFO] GCLOUD: I0707 20:55:24.240190 25 jvmti_agent.cc:192] Java debuglet
initialization completed
[INFO] GCLOUD: I0707 20:55:24.356501 25 jvmti_agent.cc:203] Java VM
started
[INFO] GCLOUD: I0707 20:55:24.369704 25 jvmti_agent.cc:213]
JvmtiAgent::JvmtiOnVMInit initialization time: 13205 microseconds
[INFO] GCLOUD: I0707 20:55:24.370100 36 jvmti_agent_thread.cc:99] Agent
thread started: CloudDebugger_main_worker_thread
[INFO] GCLOUD: I0707 20:55:24.370481 36 jvm_internals.cc:376] Loading
internals from /opt/cdbg/cdbg_java_agent_internals.jar
[INFO] GCLOUD: openjdk version "1.8.0_131"
[INFO] GCLOUD: OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-
1~bpo8+1-b11)
[INFO] GCLOUD: OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
[INFO] GCLOUD:
[INFO] GCLOUD: no main manifest attribute, in app.jar
[INFO] GCLOUD: I0707 20:55:24.495450 25 jvmti_agent.cc:221] Java VM
termination
[INFO] GCLOUD: I0707 20:55:24.781633 36 jni_logger.cc:31] Initializing
ClassPathLookup, default classpath: true, extra classpath: [], config: null
[INFO] GCLOUD: I0707 20:55:24.814752 36 jni_logger.cc:31] Total size of
indexed resources database: 846 bytes
[INFO] GCLOUD: I0707 20:55:24.825848 36 jvm_internals.cc:132]
ClassPathLookup constructor time: 48169 microseconds
[INFO] GCLOUD: I0707 20:55:24.826359 36
yaml_data_visibility_config_reader.cc:33] debugger-config.yaml was not
found. Using default settings.
[INFO] GCLOUD: E0707 20:55:24.826520 36 jni_bridge.cc:44] Bind not
allowed after Shutdown
[INFO] GCLOUD: E0707 20:55:24.826850 36 worker.cc:145] HubClient not
available: debugger thread can't continue.
[INFO] GCLOUD: I0707 20:55:24.826905 36 jvmti_agent_thread.cc:103] Agent
thread exited: CloudDebugger_main_worker_thread
[INFO] GCLOUD: I0707 20:55:24.827049 25 worker.cc:116] Debugger threads
terminated
[INFO] GCLOUD: I0707 20:55:24.827231 25 jvmti_agent.cc:235]
JvmtiAgent::JvmtiOnVMDeath cleanup time: 331800 microseconds
[INFO] GCLOUD:
[INFO] ---------------------------------------------------------------------
---
[INFO] BUILD FAILURE
[INFO] ---------------------------------------------------------------------
---
[INFO] Total time: 02:45 min
[INFO] Finished at: 2017-07-07T16:55:37-04:00
[INFO] Final Memory: 26M/524M
[INFO] ---------------------------------------------------------------------
---
[ERROR] Failed to execute goal com.google.cloud.tools:appengine-maven-
plugin:1.3.1:deploy (default-cli) on project SXXRXXXXDataFlowTransform:
Execution default-cli of goal com.google.cloud.tools:appengine-maven-
plugin:1.3.1:deploy failed: Non zero exit: 1 -> [Help 1]
我在sdk终端上使用mvn appengine：deploy命令进行部署。 我的项目是一个春季启动项目。