将jdk.tls.client.protocols系统属性设置为在Netty4.1.48中不工作的TLSv1.2开发者社区

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jdk.tls.client.protocols is defined as TLSv1.2
SSLv3 protocol was requested but was not enabled
SUPPORTED: [TLSv1, TLSv1.1, TLSv1.2]
SERVER_DEFAULT: [TLSv1, TLSv1.1, TLSv1.2]
CLIENT_DEFAULT: [TLSv1.2]
IBMJSSE2 will enable CBC protection
12:00:41.624 [redisson-netty-2-9] DEBUG io.netty.handler.ssl.JdkSslContext - Default protocols (JDK): [TLSv1]

jdk.tls.client.protocols is defined as null
SSLv3 protocol was requested but was not enabled
SSLv3 protocol was requested but was not enabled
SUPPORTED: [TLSv1, TLSv1.1, TLSv1.2]
SERVER_DEFAULT: [TLSv1, TLSv1.1, TLSv1.2]
CLIENT_DEFAULT: [TLSv1, TLSv1.1, TLSv1.2]
10:18:00.008 [redisson-netty-2-23] DEBUG io.netty.handler.ssl.JdkSslContext - Default protocols (JDK): [TLSv1.2, TLSv1.1, TLSv1]

jdk.tls.client.protocols is defined as null
SSLv3 protocol was requested but was not enabled
SSLv3 protocol was requested but was not enabled
SUPPORTED: [TLSv1, TLSv1.1, TLSv1.2]
SERVER_DEFAULT: [TLSv1, TLSv1.1, TLSv1.2]
CLIENT_DEFAULT: [TLSv1, TLSv1.1, TLSv1.2]
IBMJSSE2 will enable CBC protection
09:54:19.626 [redisson-netty-2-25] DEBUG io.netty.handler.ssl.JdkSslContext - Default protocols (JDK): [TLSv1]

java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 8.0.5.27 - pwa6480sr5fp27-20190104_01(SR5 FP27))
IBM J9 VM (build 2.9, JRE 1.8.0 Windows 10 amd64-64-Bit Compressed References 20181219_405297 (JIT enabled, AOT enabled)
OpenJ9   - 3f2d574
OMR      - 109ba5b
IBM      - e2996d1)
JCL - 20190104_01 based on Oracle jdk8u191-b26

io.netty.handler.ssl.JdkSslContext.java:97 - Default protocols (JDK): [TLSv1]
io.netty.handler.ssl.JdkSslContext.java:98 - Default cipher suites (JDK):
    [TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256,
    TLS_RSA_WITH_AES_128_CBC_SHA]

SSLContext context = SSLContext.getInstance("TLS");
context.init(null, null, null);
String[] supportedProtocols = context.getDefaultSSLParameters().getProtocols();
System.out.println(Arrays.toString(supportedProtocols));

-Dcom.ibm.jsse2.overrideDefaultTLS=true

$ java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 8.0.5.0 - pap6480sr5-20170905_01(SR5))

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问 将jdk.tls.client.protocols系统属性设置为在Netty4.1.48中不工作的TLSv1.2 EN

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