Java SE 17 常规信息和潜在问题

该规则包含一些链接，这些链接指向有关 Java SE 17 中的更改以及自 Java SE 11 以来发布的先前非 LTS（长期支持）Java 版本中的更改的信息。对于每个 Java 版本，发行说明中均包含链接，以及可能导致问题但 WebSphere Application Migration Toolkit 未检测到的特定更改。可以在以下位置中找到其他详细信息： Oracle JDK Migration Guide。

Java SE 17：

• Release Notes
• Deprecation of 3DES and RC4 in Kerberos
• URL FTP Protocol Handler: IPv4 Address Validation in Passive Mode
• Collections.unmodifiable* Methods Are Idempotent for Their Corresponding Collection
• ISO 639 Language Codes for Hebrew/Indonesian/Yiddish
• Enable XML Signature Secure Validation Mode by Default
• Disable SHA-1 XML signatures
• JEP 306: Restore Always-Strict Floating-Point Semantics

Java SE 16：

• Release Notes
• Deprecated Tracing Flags are Obsolete and Must be Replaced with Unified Logging Equivalents
• Parts of the Signal-Chaining API are Deprecated
• Support Supplementary Characters in String Case Insensitive Operations
• Proxy Classes Are Not Open for Reflective Access
• NullPointerException Not Thrown When First Argument to Path.of or Paths.get is null
• Argument Index of Zero or Unrepresentable by int Throws IllegalFormatException
• Removal of java.awt.PeerFixer
• Removed Root Certificates with 1024-bit Keys
• Disable TLS 1.0 and 1.1
• Improve Encoding of TLS Application-Layer Protocol Negotiation (ALPN) Values
• Upgraded the Default PKCS12 Encryption and MAC Algorithms

Java SE 15：

• Release Notes
• Specialized Implementations of TreeMap Methods
• Case Insensitive Matching Doesn't Work Correctly for Some Character Classes
• Support Monetary Grouping Separator in DecimalFormat/DecimalFormatSymbols
• Support for canonicalize in krb5.conf
• Disabled Biased-locking and Deprecated Biased-locking Flags

Java SE 14：

• Release Notes
• Accounting Currency Format Support
• Remove the concurrent mark and sew (CMS) Garbage collector
• Thread.countStackFrames Changed to Unconditionally Throw UnsupportedOperationException
• MethodTypefromMethodDescriptorString Requires "getClassLoader" Permission
• New Checks on Trust Anchor Certificates
• Removed SSLv2Hello and SSLv3 From Default Enabled TLS Protocols
• Default ErrorListener No Longer Reports Warnings and Errors to the Console

Java SE 13：

• Release Notes
• Removal of art.tookit system property
• Duplicated RSA Services No Longer Supported by SunJSSE Provider
• Improved Handling of the "Class-Path" JAR Manifest Attribute
• Change to Default Implementation of SocketImpl Methods supportedOptions, getOption, and setOption
• JEP 353 Reimplement the Legacy Socket API

Java SE 12：

• Release Notes
• Better HTTP Redirection Support
• Disabled TLS anon and NULL Cipher suites
• Disabled All DES TLS Cipher Suites