Are there any specific examples of backward incompatibilities between Java versions?

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is java 1.4 backwards compatible

Have there been incompatibilities between Java releases where Java source code/Java class files targeting Java version X won't compile/run under version Y (where Y > X) ?

By "Java release" I mean versions such as:

  • JDK 1.0 (January, 1996)
  • JDK 1.1 (February, 1997)
  • J2SE 1.2 (December, 1998)
  • J2SE 1.3 (May, 2000)
  • J2SE 1.4 (February, 2002)
  • J2SE 5.0 (September, 2004)
  • Java SE 6 (December, 2006)

House rules:

  • Please include references and code examples where possible.
  • Please try to be very specific/concrete in your answer.
  • A class that is being marked as @Deprecated does not count as a backwards incompatibility.

Observations From a History of Java Backwards Incompatibility , Dustin Marx discusses corner cases where backwards compatibility can have be upgraded to use newer versions of Java in a relatively easier fashion than For example, the JDK 1.2 compatibility reference states, "The String hash to depend on an object's hashCode() method to return specific codes. I'm looking for specific examples of backwards incompatibilities during the history of Perl. Question: In the 22 year history of Perl, are there any examples of Perl backwards incompatibility where Perl source code targeting Perl version X won't run under version Y (where Y > X)? Please include references and code examples when possible.

Compatibility Guide for JDK 8, Java SE 8 changed these rules in order versions of the JDK was wrong in some As an example, when using the Then, since m(String[]) is a more specific� Are there any specific examples of backward incompatibilities between Java versions? (10) Have there been incompatibilities between Java releases where Java source code/Java class files targeting Java version X won't compile/run under version Y (where Y > X) ? By "Java release" I mean versions such as:

The interface java.sql.Connection was extended from Java 1.5 to Java 1.6 making compilation of all classes that implemented this interface fail.

Java SE Compatibility at a Glance, In general, the policy is as follows, except for any incompatibilities listed Deprecated APIs are interfaces that are supported only for backwards compatibility. J2SE 5.0 is strongly compatible with previous versions of the Java 2 platform. Virtual Machine - Previously, evaluating a class literal (for example, Foo.class )� Are there any specific examples of backward incompatibilities between Java versions? What is the difference between JDK and JRE? Is Java 1.6 the same as JDK 6? Java JDK, SDK, SE? Differences between Oracle JDK and OpenJDK

Every release of Swing broke something for us, from 1.3 through 1.6.

The JDBC issue has already been mentioned, but existing code worked.

From 1.5 to 1.6 there was a change in the behavior of Socket which broke the Cisco client.

Of course new reserved keywords were introduced.

The big one which I think was truely unforgivable on Sun's part was System.getenv(). It worked in 1.0, and then was deprecated and changed to throw an error on all platforms under the rather dubious justification that the Mac didn't have system environment variables. Then the Mac got system environment variables, so in 1.5 it was undeprecated and works. There is no reasonable justification for doing that. Return an empty set on a Mac (Swing has much bigger cross-platform issues if you want to care about that level of cross platform consistency) or even on all platforms.

I never agreed with them turning off the feature, but to change it to throw an error was just a pure breaking change that if they were going to do, they should have just removed the method entirely.

But, really from 1.0 to 1.1 they were less concerned about backwards compatability. For example, they dropped "private protected" as a modifier.

So the upshot is that every version changes enough to require close evaluation, that is why you still see many 1.4 questions here on SO.

Kinds of Compatibility, Indeed, just changing the reported version number is incompatible in Binary: Binary compatibility is defined in The Java Language For example, does the change from L1 to L2 cause a problem for any program that currently exists? abstract names to more concrete names, which permits programmers� Are there any specific examples of backward incompatibilities between Java versions? Have there been incompatibilities between Java releases where Java source code/Java class files targeting Java version X won't compile/run under version Y(where Y>X) ? By "Java release" I mean vers…

The main one that I can think of is the introduction of new reserved words:

Java 1.3: strictfp
Java 1.4: assert
Java 5.0: enum

Any code that previously used these values as identifiers would not compile under a later version.

One other issue that I remember causing problems on a project that I worked on was that there was a change in the default visibility of JInternalFrames between 1.2 and 1.3. They were visible by default, but when we upgraded to 1.3 they all seemed to have disappeared.

Java API Compliance Checker, A tool for checking backward API/ABI compatibility of a Java library. result in crashing or incorrect behavior of existing clients built with an old version of Usage (Multiple Archives); Examples; Detectable Compatibility Problems; Test Suite two versions of a jar archive; Japitools - test for compatibility between Java APIs� Are there any specific examples of backward incompatibilities between Java versions? How to use a function pointer in C++ classes? Please give an examples for static and non-static classes; Can you provide some examples of why it is hard to parse XML and HTML with a regex? What is IOC? Need some practical code examples to illustrate; inpolygon

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TensorFlow version compatibility, For example, TensorFlow version 1.2.3 has MAJOR version 1, Some parts of TensorFlow can change in backward incompatible ways Java,; Go � JavaScript In particular, regression tests that check for exact matching between specific floating point values computed by ops may change at any time. There’s the special field of Android development where the Java version is basically stuck at Java 7, with a specific set of Java 8 features available. Or, you can switch to using the Kotlin

JDK Compatibility, Sometimes new JVM and JDK (Java Development Kit) versions require us to update Since the JVM tends to be backward compatible, it is usually safe to use a newer JVM rest of the ecosystem, including Scala) for longer than the versions in between. We may also test non-LTS versions, but any issues found there are� Drop-in Compatibility of Specific MariaDB Versions MariaDB 10.2 , MariaDB 10.3 , and MariaDB 10.4 function as limited drop-in replacements for MySQL 5.7, as far as InnoDB is concerned. However, the implementation differences continue to grow in each new MariaDB version.

Comments
  • do you mean 'no answer is worse that an excessively vague answer'
  • this should be definitively a community wiki
  • Why? It's a perfectly legitimate technical question...
  • Stephen C: I do need to know the answer.
  • @Sean: A good reason to need to know this answer is to advocate the choice of java against .NET or php or any competing technology for some given project in which backward compatibility is a must.
  • Introducing new, reserved keywords should be severely punished! And they did it again with enum.
  • And yet they have never removed goto as a reserved word!
  • It's interesting that there's no comment about incompatibilities of the JDBC package inside the official notes. Or did I miss it?
  • @tangens - probably not noted because JDBC client code would not be required to change to work against the new API; Java applications would generally not implement these interfaces; the database vendors would. You can find specific information in the @since tags in the javadoc and there's probably more detail in the JDBC spec: java.sun.com/products/jdbc/download.html
  • The worst part was some of the methods added in the JDBC interfaces relied on new types that didn't exist in earlier versions. This meant it was impossible to make implementations that could compile in multiple versions of the JDK.
  • I actually ran into this again myself just last week at work. We ended up resorted to writing a dynamic proxy to get an implementation that would compile in both Java 5 and 6.
  • I think all JDBC versions do that extensively. It should not be a surprise!