java 是否可以在 Tomcat 中关闭 taglib 扫描？
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Is it possible to turn off taglib scanning in Tomcat?
提问by Matt Passell
On startup, Tomcat recursively scans the WEB-INF directories for TLD (Tag Library Descriptor) files. As a result, if a webapp has a lot of files under that directory, it slows down the startup process. Does anyone know if there is a way in that situation to turn off scanning completely, or at least provide a filter to narrow the search?
启动时，Tomcat 递归扫描 WEB-INF 目录以查找 TLD（标记库描述符）文件。因此，如果一个 webapp 在该目录下有很多文件，它会减慢启动过程。有谁知道在这种情况下是否有办法完全关闭扫描，或者至少提供一个过滤器来缩小搜索范围？
回答by ZZ Coder
You can add processTlds attributes in the context,
您可以在上下文中添加 processTlds 属性，
<Context processTlds="false" ... />
However, your TLDs defined in the JAR file wouldn't work without scanning the JARs. You have to define all TLDs in WEB-INF.
但是，如果不扫描 JAR，您在 JAR 文件中定义的 TLD 将无法工作。您必须在 WEB-INF 中定义所有 TLD。
回答by Igor Semenko
I was puzzled by the same problem. Looking into source code of Tomcat 7.0.40, it is not possible to avoid jars scanning by setting 'processTlds=false', they will still be scanned for web fragments (ContextConfig.processJarsForWebFragments()).
我对同样的问题感到困惑。查看 Tomcat 7.0.40 的源代码，无法通过设置“processTlds=false”来避免 jars 扫描，它们仍将被扫描以查找 Web 片段（ContextConfig.processJarsForWebFragments()）。
There are 2 options remaining:
剩下2个选项：
Set property in TOMCAT_HOME/conf/catalina.properties
在 TOMCAT_HOME/conf/catalina.properties 中设置属性
org.apache.catalina.startup.ContextConfig.jarsToSkip=*.jar
Replace StandardJarScanner by your own implementation, for example empty one and refer to it from my.war/META-INF/context.xml:
用你自己的实现替换 StandardJarScanner，例如空一个并从 my.war/META-INF/context.xml 引用它：
<Context processTlds="false">
<JarScanner className="org.my.tomcat.NullJarScanner"/>
</Context>
In latter case you'll need to make sure that NullJarScanner class is available in tomcat's lib directory, not your .war
在后一种情况下，您需要确保 NullJarScanner 类在 tomcat 的 lib 目录中可用，而不是您的 .war
回答by Sergey
On Tomcat 8 it can be solved by adding the META-INF\context.xmlwith the configuration seen below to your WAR file.
No need to change the global Tomcat configuration.
在 Tomcat 8 上，它可以通过将META-INF\context.xml下面看到的配置添加到您的 WAR 文件中来解决。无需更改全局 Tomcat 配置。
<?xml version="1.0" encoding="UTF-8"?>
<Context>
<JarScanner>
<JarScanFilter tldSkip="*.*"/>
</JarScanner>
</Context>
The relevant documentation is available here: http://tomcat.apache.org/tomcat-8.0-doc/config/jar-scan-filter.html
相关文档可在此处获得：http: //tomcat.apache.org/tomcat-8.0-doc/config/jar-scan-filter.html
回答by Vadim Ponomarev
As an alternative (if you still prefer to scan some JARs) you could append new values to "tomcat.util.scan.DefaultJarScanner.jarsToSkip" property in "{TOMCAT_HOME}/conf/catalina.properties".
作为替代方案（如果您仍然喜欢扫描一些 JAR），您可以将新值附加到“{TOMCAT_HOME}/conf/catalina.properties”中的“tomcat.util.scan.DefaultJarScanner.jarsToSkip”属性。
