jproperties

JVM	Platform	Status
OpenJDK (Temurin) Current	Linux
OpenJDK (Temurin) LTS	Linux
OpenJDK (Temurin) Current	Windows
OpenJDK (Temurin) LTS	Windows

jproperties

Java functions to access values from java.util.Properties collections in
a typed manner.

Features

• Functions to access java.util.Properties values as typed values.
• High coverage test suite.
• OSGi-ready
• JPMS-ready
• ISC license.

Usage

The JProperties class contains numerous functions to extract typed values
from a Properties collection:

final var p = new Properties();
p.setProperty("int0", "23");
p.setProperty("b0", "true");
JProperties.getBoolean(p, "b0");       // ⇒ true
JProperties.getBigInteger(p, "int0");  // ⇒ new BigInteger(23)

If a property is not present, or has a value that cannot be parsed as a value
of the requested type, a JPropertyException is raised.

JProperties.getBigInteger(p, "nonexistent") // ⇒ JPropertyNonexistent
JProperties.getBigInteger(p, "b0");         // ⇒ JPropertyIncorrectType

Functions typically have an optional variant that returns an Optional.empty()
value on missing keys (but an exception will still be raised on type errors).

JProperties.getStringOptional(p, "nonexistent") // ⇒ Optional.empty()
JProperties.getStringOptional(p, "b0");         // ⇒ "true"

Functions typically also have a default variant that can return a given
default value if a property is not present (but an exception will still be
raised on type errors).

JProperties.getStringWithDefault(p, "nonexistent", "z") // ⇒ "z"
JProperties.getStringWithDefault(p, "b0", "z");         // ⇒ "true"