java.lang.IllegalAccessError：尝试从类sun.security.ssl.ClientHandshaker访问字段sun.security.ssl.Handshaker.localSupportedSignAlgs

Question

Still trying to deploy and get my server running .. As my Cloud SQL database is getting initialized I am getting the following exception:

[main] ERROR com.mz.server.BootstrappingServerConfig - Error trying to migrate SQL scripts ..
at org.flywaydb.core.internal.util.jdbc.JdbcUtils.openConnection(JdbcUtils.java:56)
    at org.flywaydb.core.Flyway.migrate(Flyway.java:1006)
    at com.mz.database.SqlDatabaseBootstrapper.executeMigration(SqlDatabaseBootstrapper.java:60)
    at com.mz.server.BootstrappingServerConfig.contextInitialized(BootstrappingServerConfig.java:46)
    ...
Caused by: java.sql.SQLException: java.lang.IllegalAccessError: tried to access field sun.security.ssl.Handshaker.localSupportedSignAlgs from class sun.security.ssl.ClientHandshaker
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)
    ...
Caused by: java.lang.IllegalAccessError: tried to access field sun.security.ssl.Handshaker.localSupportedSignAlgs from class sun.security.ssl.ClientHandshaker
    at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:285)
    at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
    at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
    ...

I am not sure what information I should deliver here - this would be my app.yaml :

runtime: java
vm: true

runtime_config:
  jdk: openjdk8
  server: jetty9

env_variables:
  'ALPN_ENABLE': 'true'   # OPTIONAL

beta_settings:
  cloud_sql_instances: mahlzeit-test:us-central1:mahlzeit-life-cloudsql-prod

health_check:
  enable_health_check: false

This is how I am configuring my DataSource in my Spring Application Context:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    <property name="url" value="jdbc:mysql://google/mz_db?cloudSqlInstance=mz-test:us-central1:mz-life-cloudsql-prod&amp;socketFactory=com.google.cloud.sql.mysql.SocketFactory" />
    <property name="username" value="root" />
    <property name="password" value="" />
</bean>

The compute instances which are accessing the Cloud SQL instances are in the same project.

Why am I getting

java.lang.IllegalAccessError: tried to access field sun.security.ssl.Handshaker.localSupportedSignAlgs from class sun.security.ssl.ClientHandshaker

and how can I fix this?

---

Running mvn dependency:list

[INFO] Scanning for projects...
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[INFO] Building mz-web-server 0.1-SNAPSHOT
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[INFO]    org.springframework:spring-test:jar:4.0.3.RELEASE:compile
[INFO]    mysql:mysql-connector-java:jar:5.1.39:compile
[INFO]    org.apache.maven.wagon:wagon-provider-api:jar:1.0-beta-6:compile
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[INFO]    com.paypal.sdk:rest-api-sdk:jar:1.6.0:compile
[INFO]    org.springframework:spring-webmvc:jar:4.2.3.RELEASE:compile
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[INFO]    com.squareup.okio:okio:jar:1.6.0:compile
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[INFO]    org.apache.httpcomponents:httpcore:jar:4.3.2:compile
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[INFO]    org.hamcrest:hamcrest-core:jar:1.3:test
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[INFO]    javax.servlet:javax.servlet-api:jar:3.0.1:provided
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[INFO] Total time: 1.730 s
[INFO] Finished at: 2016-06-06T09:27:35+02:00
[INFO] Final Memory: 16M/226M
[INFO] ------------------------------------------------------------------------

Answer 1

The problem was

env_variables:
  'ALPN_ENABLE': 'true'   # OPTIONAL

which I simply used from a tutorial without thinking about what that is/means.

ALPN is a library which appears to optimize HTTPS requests. I tried to add the library to my dependencies which did not work . Maybe I got the wrong version or something like that. However, at the moment this is no requirement for me.

To solve the issue I simply removed this variable. Setting it to 'false' should also do it.