this.projectDirectory = projectDirectory;

        return this;
    }

    @Override
    public Map<String, String> getProjectProperties() {
        return projectProperties;
    }

    public DefaultProfileActivationContext setProjectProperties(Properties projectProperties) {
        return setProjectProperties(toMap(projectProperties));

            byNamePrefix(ENV_PROJECT_PROPERTIES_PREFIX) >> { prefixedEnvironmentVariables }
        }
    }

    private final StartParameterInternal startParameter = Mock(StartParameterInternal) {
        getProjectProperties() >> { projectPropertiesArgs }
        getSystemPropertiesArgs() >> { systemPropertiesArgs }
        getGradleUserHomeDir() >> gradleUserHome
    }

    @Rule

            fileListSerializer.write(encoder, startParameter.getIncludedBuilds());

            // Other stuff
            NO_NULL_STRING_MAP_SERIALIZER.write(encoder, startParameter.getProjectProperties());
            NO_NULL_STRING_MAP_SERIALIZER.write(encoder, startParameter.getSystemPropertiesArgs());
            fileListSerializer.write(encoder, startParameter.getInitScripts());

            this.currentDir = FileUtils.canonicalize(currentDir);
        } else {
            this.currentDir = new BuildLayoutParameters().getCurrentDir();
        }
    }

    public Map<String, String> getProjectProperties() {
        return projectProperties;
    }

    public void setProjectProperties(Map<String, String> projectProperties) {
        this.projectProperties = projectProperties;
    }

 * link:{javadocPath}/org/gradle/StartParameter.html#getProjectProperties--[StartParameter.projectProperties] and link:{javadocPath}/org/gradle/StartParameter.html#getSystemPropertiesArgs--[StartParameter.systemPropertiesArgs] now return immutable maps.

[[changes_4.6]]