How to disable PDFBox warn logging

Question

I have a simple java console application. pdfbox is utilized to extract text from PDF files. But there is continuous info printed in console:

十一月 29, 2017 9:28:27 下午 org.apache.pdfbox.pdmodel.font.PDSimpleFont toUnicode

警告: No Unicode mapping for 14 (145) in font GGNHDZ+SimSun  

十一月 29, 2017 9:28:27 下午 org.apache.pdfbox.pdmodel.font.PDSimpleFont toUnicode

警告: No Unicode mapping for 28 (249) in font LNKLJH+SimSun

十一月 29, 2017 9:28:27 下午 org.apache.pdfbox.pdmodel.font.PDSimpleFont toUnicode

I really want to remove this information from the console. And I use logback for logging, the logback.xml is just like:

<?xml version="1.0" encoding="UTF-8"?>

<configuration>

<logger name="org.apache.pdfbox" level="ERROR"/>

<timestamp key="timestamp-by-second" datePattern="yyyyMMdd'T'HHmmss"/>

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">

    <!-- encoder 默认配置为PatternLayoutEncoder -->

    <encoder>

        <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>

    </encoder>

</appender>

<appender name="FILE" class="ch.qos.logback.core.FileAppender">

    <file>logs/test-${timestamp-by-second}.log</file>

    <append>true</append>

    <encoder>

        <pattern>%-4relative [%thread] %-5level %logger{35} - %msg%n

        </pattern>

    </encoder>

</appender>

<root level="ERROR">

    <appender-ref ref="FILE" />

    <appender-ref ref="STDOUT" />

</root>

I have find some answer say that should change the Level. I have changed the level to ERROR. But still not work. I am doubting if the info has something with logback.xml. Because when I remove STDOUT, the pdfbox warn info still print in the console.

Anybody know this case? Thank you in advance.

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Answer 1

If the logging was being emitted by Logback then the approach you have tried, for example ...

Adding <logger name="org.apache.pdfbox" level="ERROR"/>
Removing the STDOUT appender

... would work.

However, PDFBox doesn't use Logback, instead it uses Apache Commons Logging (http://commons.apache.org/logging/). There are several ways of disabling Commons Logging:

Disable Commons Logging entirely by adding the following to your Main class' static initialiser block, this *must** be executed before PDFBOX creates a Log instance:
```
static {
    System.setProperty("org.apache.commons.logging.Log",
                 "org.apache.commons.logging.impl.NoOpLog");
}
```
Disable Commons Logging by passing the following JVM parameter when you start your application:
```
-Dorg.apache.commons.logging.Log=org.apache.commons.logging.impl.NoOpLog` 
```
Disable Commons Logging for the PDFBOX namespace by adding the following to your Main class' static initialiser block, this *must** be executed before PDFBOX creates a Log instance (note: you could alternatively use Level.SEVERE, depending on how much tolerance you have for PDFBOX's log output):
```
java.util.logging.Logger.getLogger("org.apache.pdfbox")
    .setLevel(java.util.logging.Level.OFF);
```

How to disable PDFBox warn logging

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