refactor(core): align logging/Throwable handling with 3.0.x (logic parity)

- SampleDocument: catch Throwable + LOG.warn (absorb macOS FOP font AssertionError)
- WordprocessingMLTemplate: System.out.println -> LOG.debug (add slf4j LOG field)
- PackageBuilder: printStackTrace -> LOG.warn (add LOG field)
Verified (JDK 8): core 352 tests green.

Author: loong10k

easydoc-core/src/main/java/io/github/easy4j/doc/SampleDocument.java

@@ -13,13 +13,17 @@
 
 import org.docx4j.XmlUtils;
 import org.docx4j.fonts.PhysicalFont;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.docx4j.fonts.PhysicalFonts;
 import org.docx4j.openpackaging.parts.WordprocessingML.MainDocumentPart;
 
 /** This class generates a sample document in case no
  *  document has been passed.
  */
 public class SampleDocument {
+
+	private static final Logger LOG = LoggerFactory.getLogger(SampleDocument.class);
 
 	public static void createContent(MainDocumentPart wordDocumentPart ) {
 		/*
@@ -63,8 +67,10 @@ public static void createContent(MainDocumentPart wordDocumentPart ) {
 			    }
 
 			}
-		} catch (Exception e) {
-			e.printStackTrace();
+		} catch (Throwable e) {
+			// 捕获 Throwable（含 AssertionError）：macOS 上 FOP 字体解析
+			// 会对特定系统字体抛 AssertionError，不能让其中断文档生成
+			LOG.warn("Failed to create sample document content", e);
 		}    		    
 
 	}

easydoc-core/src/main/java/io/github/easy4j/doc/WordprocessingMLTemplate.java

@@ -21,6 +21,8 @@
 import java.util.Map;
 
 import org.docx4j.Docx4J;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.docx4j.openpackaging.packages.WordprocessingMLPackage;
 
 /**
@@ -29,6 +31,9 @@
  * @author <a href="https://github.com/loong10k">Loong Wan</a>
  */
 public interface WordprocessingMLTemplate {
+
+	Logger LOG = LoggerFactory.getLogger(WordprocessingMLTemplate.class);
+
 
 	/**
  * Contract interface for WordprocessingMLTemplate operations.
@@ -40,11 +45,11 @@ default WordprocessingMLPackage process(File template, Map<String, Object> varia
 		WordprocessingMLPackage wordMLPackage;
 		if (template == null || !template.exists() || !template.isFile() ) {
 			// Create a docx
-			System.out.println("No imput path passed, creating dummy document");
+			LOG.debug("No imput path passed, creating dummy document");
 			wordMLPackage = WordprocessingMLPackage.createPackage();
 			SampleDocument.createContent(wordMLPackage.getMainDocumentPart());	
 		} else {
-			System.out.println("Loading file from " + template.getAbsolutePath());
+			LOG.debug("Loading file from {}", template.getAbsolutePath());
 			wordMLPackage = Docx4J.load(template);
 		}
 		return wordMLPackage;
@@ -60,11 +65,11 @@ default WordprocessingMLPackage process(InputStream template, Map<String, Object
 		WordprocessingMLPackage wordMLPackage;
 		if (template == null) {
 			// Create a docx
-			System.out.println("No imput path passed, creating dummy document");
+			LOG.debug("No imput path passed, creating dummy document");
 			wordMLPackage = WordprocessingMLPackage.createPackage();
 			SampleDocument.createContent(wordMLPackage.getMainDocumentPart());	
 		} else {
-			System.out.println("Loading file from InputStream");
+			LOG.debug("Loading file from InputStream");
 			wordMLPackage = Docx4J.load(template);
 		}
 		return wordMLPackage;

easydoc-xhtml/src/main/java/io/github/easy4j/doc/xhtml/io/WordprocessingMLPackageBuilder.java

@@ -40,6 +40,9 @@
  */
 public class WordprocessingMLPackageBuilder {
 
+	private static final org.slf4j.Logger LOG = org.slf4j.LoggerFactory.getLogger(WordprocessingMLPackageBuilder.class);
+
+
 	protected DocumentHandler docHandler = XHTMLDocumentHandler.getDocumentHandler();
 
 	private static final WordprocessingMLPackageBuilder WML_PACKAGE_BUILDER = new WordprocessingMLPackageBuilder();
@@ -75,7 +78,7 @@ public WordprocessingMLPackageBuilder configDefaultFont(WordprocessingMLPackage
 			PhysicalFontUtils.setDefaultFont(wmlPackage, fontName);
 		} catch (Exception e) {
 			// TODO Auto-generated catch block
-			e.printStackTrace();
+			LOG.warn("Failed to set fonts", e);
 		}
         //返回WordprocessingMLPackage对象
       	return this;