I am using PDFBox to convert PDF file to TIF files.
It works in Windows platform, but fail to execute in AIX platformt.
We can see the warning message in System.out.log:
1 2 | [WARN][WebContainer : 11][Line:444][org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.loadDiskCache]New fonts found, font cache will be re-built [WARN][WebContainer : 11][Line:224][org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.<init>]Building on-disk font cache, this may take a while |
This warning message is printed from here:
https://github.com/apache/pdfbox/blob/04292e421e9531616aa2856b908fbdb05b381af7/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/FileSystemFontProvider.java#L224-L226
But it is difficult to judge the root causes why it spend lots of time to load font files
https://github.com/apache/pdfbox/blob/04292e421e9531616aa2856b908fbdb05b381af7/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/FileSystemFontProvider.java#L237-L277
Solution
In FontMapperImpl, we can see it add lots of fonts substitutes. It may be the reason:
https://github.com/apache/pdfbox/blob/04292e421e9531616aa2856b908fbdb05b381af7/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/font/FontMapperImpl.java#L55-L127
Hence, we write a PdfBoxInitiazlier class to set empty collection to FontMapperImpl:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | package org.apache.pdfbox.pdmodel.font; import java.util.Collections; import java.util.List; import javax.annotation.PostConstruct; import org.springframework.stereotype.Component; @Component public class PdfBoxInitiazlier { @PostConstruct public void setUpPdfBox() { FontMapperImpl mapper = new FontMapperImpl(); FontProvider provider = new EmptyFontProvider(); mapper.setProvider(provider); org.apache.pdfbox.pdmodel.font.FontMappers.set(mapper); } private static class EmptyFontProvider extends FontProvider { public String toDebugString() { return "EmptyFontProvider"; } public List<? extends FontInfo> getFontInfo() { return Collections.emptyList(); } } } |
Owing to our project use Spring boot, then PdfBoxInitiazlier component will be scanned and overwrited it.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | import lombok.extern.slf4j.Slf4j; import org.apache.pdfbox.pdmodel.font.PdfBoxInitiazlier; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Import; import com.cht.compost.context.web.CompostServletInitializer; import com.yuantalife.ecp.manage.common.EcpManageConfiguration; import com.yuantalife.ecp.member.EcpManageMemberConfiguration; @Slf4j @SpringBootApplication @ComponentScan({ "com.xxx.ecp" }) @Import({ EcpManageConfiguration.class, EcpManageMemberConfiguration.class }) public class Application extends CompostServletInitializer { public static void main(String[] args) { SpringApplication.run(Application.class, args); } @Bean public PdfBoxInitiazlier pdfBoxInitializer() { log.info("enter pdfBoxInitializer"); return new PdfBoxInitiazlier(); } } |
It is a workaround solution to fix "Building on-disk font cache, this may take a while" warning problem.
Although it is just a warning message, it result in my function cannot be executed successfully.
