added slf4j with log4j2

pom.xml

@@ -12,6 +12,7 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<guidelines.project.dir>../guidelines-cris-managers</guidelines.project.dir>
+		<logger.version>2.23.1</logger.version>
 		<fully.qualified.main.class.name>org.eurocris.openaire.cris.validator.CRISValidator</fully.qualified.main.class.name>
 		<maven.compiler.version>17</maven.compiler.version>
 	</properties>
@@ -37,6 +38,27 @@
 			<version>2.3.8</version>
 			<scope>runtime</scope>
 		</dependency>
+
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-api</artifactId>
+			<version>${logger.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-core</artifactId>
+			<version>${logger.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-slf4j-impl</artifactId>
+			<version>${logger.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>com.lmax</groupId>
+			<artifactId>disruptor</artifactId>
+			<version>4.0.0</version>
+		</dependency>
 	</dependencies>
 	<build>
 		<plugins>

src/main/java/org/eurocris/openaire/cris/validator/CRISValidator.java

@@ -60,6 +60,8 @@
 import org.openarchives.oai._2.SetType;
 import org.openarchives.oai._2.StatusType;
 import org.openarchives.oai._2_0.oai_identifier.OaiIdentifierType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.xml.sax.ErrorHandler;
@@ -77,6 +79,8 @@
 @FixMethodOrder( value=MethodSorters.NAME_ASCENDING )
 public class CRISValidator {
 
+	private static final Logger logger = LoggerFactory.getLogger(CRISValidator.class);
+
 	/**
 	 * The spec of the set of equipments.
 	 */
@@ -221,7 +225,7 @@ private static Schema getSchema( final StreamSource ... sources ) throws IOExcep
 			final String targetNamespace = doc.getDocumentElement().getAttribute( "targetNamespace" );
 			schemaUrlsByNs.put( targetNamespace, schemaUrl );
 			nssBySchemaUrl.put( schemaUrl, targetNamespace );
-			System.out.println( "Will use " + schemaUrl + " for namespace " + targetNamespace );
+			logger.info( "Will use " + schemaUrl + " for namespace " + targetNamespace );
 		}
 		return getXmlSchemaFactory().newSchema( schemaList.toArray( new Source[0] ) );
 	}
@@ -382,7 +386,7 @@ public void check010_MetadataFormats() throws Exception {
 		} );
 		final long nMetadataFormats = checker.run();
 		final int nOpenAireMetadataFormats = metadataFormatsByPrefix.size();
-		System.out.println( "Having " + nOpenAireMetadataFormats + " OpenAIRE CRIS metadata formats (out of the total " + nMetadataFormats + " metadata formats)" );
+		logger.info( "Having " + nOpenAireMetadataFormats + " OpenAIRE CRIS metadata formats (out of the total " + nMetadataFormats + " metadata formats)" );
 	}
 
 	private CheckingIterable<MetadataFormatType> wrapCheckMetadataFormatPresent( final CheckingIterable<MetadataFormatType> parent ) {
@@ -396,7 +400,7 @@ public boolean test( final MetadataFormatType mf ) {
 					try {
 						final DocumentBuilder db = getDocumentBuilderFactory().newDocumentBuilder();
 						final String schemaUrl = mf.getSchema();
-						System.out.println( "Metadata format prefix " + mf.getMetadataPrefix() + " with ns " + mf.getMetadataNamespace() );
+						logger.info( "Metadata format prefix " + mf.getMetadataPrefix() + " with ns " + mf.getMetadataNamespace() );
 						assertTrue( "Please reference the official XML Schema at " + OPENAIRE_CERIF_SCHEMAS_ROOT + " (2h)", schemaUrl.startsWith( OPENAIRE_CERIF_SCHEMAS_ROOT ) );
 						assertTrue( "The schema file should be " + OPENAIRE_CERIF_SCHEMA_FILENAME + " (2i)", schemaUrl.endsWith( "/" + OPENAIRE_CERIF_SCHEMA_FILENAME ) );
 						final String localSchemaUrl = schemaUrlsByNs.get( metadataNs );
@@ -729,7 +733,7 @@ public void error( final SAXParseException exception ) throws SAXException {
 					final String msg = exception.getMessage();
 					if ( msg.startsWith( "cvc-pattern-valid: " ) ) {
 						patternValidErrorSignalled = true;
-						System.err.println( "In " + elString + ": " + msg );
+						logger.error( "In " + elString + ": " + msg );
 					} else {
 						if (!( patternValidErrorSignalled && msg.startsWith( "cvc-complex-type.2.2: " ) )) {
 							throw exception;

src/main/java/org/eurocris/openaire/cris/validator/OAIPMHEndpoint.java

@@ -40,6 +40,8 @@
 import org.openarchives.oai._2.ResumptionTokenType;
 import org.openarchives.oai._2.SetType;
 import org.openarchives.oai._2_0.oai_identifier.OaiIdentifierType;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.xml.sax.SAXException;
 
 /**
@@ -48,6 +50,8 @@
  * @author jdvorak
  */
 public class OAIPMHEndpoint {
+
+	private static final Logger logger = LoggerFactory.getLogger(OAIPMHEndpoint.class);
 
 	private final String baseUrl;
 
@@ -200,7 +204,7 @@ public Iterable<HeaderType> callListIdentifiers( final String metadataFormatPref
 	@SuppressWarnings( "unchecked")
 	private OAIPMHtype makeConnection( final boolean repoWideRequest, final String verb, final String... params ) throws IOException, SAXException, JAXBException {
 		final URL url = makeUrl( verb, params );
-		System.out.println( "Fetching and validating " + url.toExternalForm() );
+		logger.info( "Fetching and validating " + url.toExternalForm() );
 		final URLConnection conn = handleCompression( url.openConnection() );
 		conn.setRequestProperty( "User-Agent", userAgent );
 		conn.setRequestProperty( "Accept", "text/xml, application/xml" );
@@ -239,7 +243,7 @@ private void checkContentTypeHeader( final URLConnection conn ) {
 		// in the light of RFC7303 section 9.2 we accept "application/xml" as equivalent
 		final String contentType = conn.getContentType();
 		if (!( contentType.startsWith( "text/xml" ) || contentType.startsWith( "application/xml" ) )) {
-			System.err.println( "The Content-Type doesn't start with 'text/xml' or 'application/xml': " + contentType );
+			logger.error( "The Content-Type doesn't start with 'text/xml' or 'application/xml': " + contentType );
 		}
 	}
 

src/main/resources/log4j2.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="INFO">
+    <Appenders>
+        <Console name="stdout" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %highlight{%-5level} [%15.15t] %-40.40c{1.}: %m%n"/>
+        </Console>
+    </Appenders>
+
+    <Loggers>
+        <AsyncRoot level="DEBUG">
+            <AppenderRef ref="stdout"/>
+        </AsyncRoot>
+    </Loggers>
+</Configuration>