Class PemEncodingsPreviewExamples

java.lang.Object

net.jrodolfo.java_evolution.java25.PemEncodingsPreviewExamples

public class PemEncodingsPreviewExamples
extends Object

Demonstrates Java 25 PEM encodings of cryptographic objects, previewed by JEP 470.

The repository itself does not compile against preview APIs. Instead, this example writes a small Java 25 source file, compiles it with javac --enable-preview --release 25, and runs it with java --enable-preview when the active toolchain is JDK 25. That keeps the main build stable while still demonstrating the real preview API.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final record	PemEncodingsPreviewExamples.CommandResult	Result from one child process invocation.
static final record	PemEncodingsPreviewExamples.PemWorkflowResult	Result from compiling and running the generated preview source.

Constructor Summary

Constructors

Constructor	Description
PemEncodingsPreviewExamples()

Method Summary

Modifier and Type	Method	Description
String	java25Idea()	Explains what the Java 25 preview API provides.
String	manualParsingProblem()	Explains the problem that Java 25 PEM support addresses.
String	previewBoundary()	Explains why this example uses a child process.
String	probeSource()	Source used by the child JVM to exercise the Java 25 preview API.
PemEncodingsPreviewExamples.PemWorkflowResult	runPemWorkflow(Path workspace)	Runs a real Java 25 preview PEM workflow in a temporary workspace.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PemEncodingsPreviewExamples

public PemEncodingsPreviewExamples()

Method Details

runPemWorkflow

public PemEncodingsPreviewExamples.PemWorkflowResult runPemWorkflow(Path workspace)
                                                             throws IOException,
InterruptedException

Runs a real Java 25 preview PEM workflow in a temporary workspace. Full child-compilation execution requires a JDK 25 preview compiler.

Parameters:

workspace - temporary directory for generated source and class files

Returns:

result containing compilation and execution output

Throws:

IOException - when the source file cannot be written

InterruptedException - when waiting for a child process is interrupted

probeSource

public String probeSource()

Source used by the child JVM to exercise the Java 25 preview API.

Returns:

generated Java source

manualParsingProblem

public String manualParsingProblem()

Explains the problem that Java 25 PEM support addresses.

Returns:

a short problem statement

java25Idea

public String java25Idea()

Explains what the Java 25 preview API provides.

Returns:

a short feature explanation

previewBoundary

public String previewBoundary()

Explains why this example uses a child process.

Returns:

the preview boundary