kwin commented on code in PR #762:
URL: https://github.com/apache/maven-surefire/pull/762#discussion_r1678103033
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maven-surefire-common/src/main/java/org/apache/maven/plugin/surefire/AbstractSurefireMojo.java:
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@@ -319,25 +320,49 @@ public abstract class AbstractSurefireMojo extends
AbstractMojo implements Suref
*/
@Deprecated
@Parameter
- private Properties systemProperties;
+ Properties systemProperties;
/**
* List of System properties to pass to a provider.
* The effective system properties given to a provider are contributed
from several sources:
* <ol>
+ * <li>properties set via {@link #argLine} with {@code -D} (only for
forked executions)</li>
* <li>{@link #systemProperties}</li>
* <li>{@link AbstractSurefireMojo#getSystemPropertiesFile()} (set via
parameter {@code systemPropertiesFile} on some goals)</li>
* <li>{@link #systemPropertyVariables}</li>
- * <li>User properties from {@link MavenSession#getUserProperties()},
usually set via CLI options given with {@code -D}</li>
+ * <li>User properties from {@link MavenSession#getUserProperties()},
usually set via CLI options given with {@code -D} on the current Maven
process</li>
+ * <li>{@link #userPropertyVariables}</li>
* </ol>
* Later sources may overwrite same named properties from earlier sources,
that means for example that one cannot overwrite user properties with either
- * {@link #systemProperties}, {@link
AbstractSurefireMojo#getSystemPropertiesFile()} or {@link
#systemPropertyVariables}.
+ * {@link #systemProperties}, {@link #getSystemPropertiesFile()} or {@link
#systemPropertyVariables} but only with
+ * {@link #userPropertyVariables}.
+ * <p>
+ * Certain properties may only be overwritten via {@link #argLine}
(applicable only for forked executions) because their values are cached and
only evaluated at the start of the JRE.
+ * Those include:
+ * <ul>
+ * <li>{@code java.library.path}</li>
+ * <li>{@code file.encoding}</li>
+ * <li>{@code jdk.map.althashing.threshold}</li>
+ * <li>{@code line.separator}</li>
+ * </ul>
*
* @since 2.5
* @see #systemProperties
*/
@Parameter
- private Map<String, String> systemPropertyVariables;
+ Map<String, String> systemPropertyVariables;
+
+ /**
+ * List of user properties to pass to a provider.
+ * Similar to {@link #systemPropertyVariables} but having a higher
precedence, therefore allows to overwrite user properties from the current
Maven session.
+ * This should only be used in case a user property from the parent
process needs to be explicitly overwritten.
+ * Regular properties should be set via {@link #systemPropertyVariables}
instead in order to allow them to be overwritten
+ * via CLI arguments ({@code -Dmyproperty=myvalue})
+ * @since 3.4
+ * @see #systemPropertyVariables
+ */
+ @Parameter
+ Map<String, String> userPropertyVariables;
Review Comment:
> I would like to consider changing a priority for systemPropertyVariables,
...
> Maybe we should don't pass a MavenSession#getUserProperties() by default
to tests ....
Both approaches will potentially trigger backwards compatibility issues for
certain edge cases. I don't think we can do that for a 3.x release.
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