Intellij Idea Spring Boot Launcher：Taglibs不在Freemarker中加载

Question

I have web app which is launched on the spring boot 2.0.4. Dependencies also exists taglibs-standard-impl 1.2.5.
My project structure is as follows.

web/
├── src
   ├── main
   │   ├── java
   │   │   
   │   ├── resources
   │   │   ├── i18n
   │   │   ├── static
   │   │   └── templates
   │   └── webapp
   │       ├── META-INF
   │       └── WEB-INF
   └── test
       └── java

In WEB-INF i have folder tld with one custom tld. My main class:

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class})
public class WebMain extends SpringBootServletInitializer implements WebApplicationInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(WebMain.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(WebMain.class, args);
    }
}

The problem is the following and basically it affects the development time. In my main freemarker template i include taglibs, for example:

<#assign form=JspTaglibs["http://www.springframework.org/tags/form"]/>
<#assign spring=JspTaglibs["http://www.springframework.org/tags"]/>
<#assign common = JspTaglibs["/WEB-INF/tld/common.tld"]>

And the problem is that when running in the intellij IDEA via the spring boot launcher, these taglibs can not boot correctly. If I deploy war in Tomcat or run directly without intellij like java -jar web.war, all is well, taglibs is loaded.

As I understood when debugging, the problem is that it can not find the WEB-INF folder in TaglibFactory class if it uses the spring boot launcher of IntellijIdea. In it, any calls caused through

servletContext.getResourcePaths (path);

where path starts with "/WEB-INF", always return null and accordingly nothing can not be loaded to tldLocations. Intellij have 4 types shorten command lines: none, JAR manifest, classpath file and user-local-default: none. I tried to use them all, but everything also remained. For example, JAR manifest generate command like like this:

/usr/lib/jvm/java-8-oracle/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:40359,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -javaagent:/home/birthright/IDEA/lib/rt/debugger-agent.jar=file:/tmp/capture128.props -Dfile.encoding=UTF-8 -classpath /tmp/classpath1030746450.jar com.birthright.WebMain

Is it possible to solve this problem?

Answer 1

WAR deployment differs in many aspects from running the application via the Spring Boot run configuration inside the IDE. You can try to replicate all the packaging Gradle/Maven does in your run configuration eg via IntelliJ's artifacts.

Answer 2

Not sure where exactly your TLD files are when you launch the application directly from the IDE, but certainly they aren't on one of the places that the JSP specification specifies, and by default TaglibFactory follows the specs. But you could configure it otherwise by calling setMetaInfTldSources or setClasspathTlds . So you have to tweak the TaglibFactory that Spring uses; see examples of that in Custom EL functions won't be loaded because no ObjectWarpper was specified .

BTW, what FreemarkerServlet does (which is not used by Spring AFAIR) is that you can set the org.freemarker.jsp.classpathTlds and org.freemarker.jsp.metaInfTldSources Java system properties to do this, so that you can do these tweaks purely in the IDE launch configuration (eg you add -Dorg.freemarker.jsp.metaInfTldSources=classpath to the Java options). That's an idea you could easily re-implement.