Tweak Tomcat performance

This commit does the following things :

* Increase Tomcat resource cache size to be able to actually store
  something in there.
* Increase Tomcat resource cache TTL to avoid costly evictions
* Put Jasper in production mode to avoid recompiling JSPs

libresonic-main/src/main/java/org/libresonic/player/boot/Application.java

@@ -1,6 +1,9 @@
 package org.libresonic.player.boot;
 
 import net.sf.ehcache.constructs.web.ShutdownListener;
+import org.apache.catalina.Container;
+import org.apache.catalina.Wrapper;
+import org.apache.catalina.webresources.StandardRoot;
 import org.directwebremoting.servlet.DwrServlet;
 import org.libresonic.player.filter.*;
 import org.libresonic.player.spring.LibresonicPropertySourceConfigurer;
@@ -11,6 +14,10 @@ import org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration
 import org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
+import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
+import org.springframework.boot.context.embedded.tomcat.TomcatContextCustomizer;
+import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.boot.web.support.SpringBootServletInitializer;
@@ -32,7 +39,7 @@ import javax.servlet.ServletContextListener;
         "classpath:/applicationContext-cache.xml",
         "classpath:/applicationContext-sonos.xml",
         "classpath:/libresonic-servlet.xml"})
-public class Application extends SpringBootServletInitializer {
+public class Application extends SpringBootServletInitializer implements EmbeddedServletContainerCustomizer {
 
     /**
      * Registers the DWR servlet.
@@ -163,6 +170,33 @@ public class Application extends SpringBootServletInitializer {
         return doConfigure(application);
     }
 
+    @Override
+    public void customize(ConfigurableEmbeddedServletContainer container) {
+        if (container instanceof TomcatEmbeddedServletContainerFactory) {
+            TomcatEmbeddedServletContainerFactory tomcatFactory = (TomcatEmbeddedServletContainerFactory) container;
+            tomcatFactory.addContextCustomizers((TomcatContextCustomizer) context -> {
+
+                // Increase the size and time before eviction of the Tomcat
+                // cache so that resources aren't uncompressed too often.
+                // See https://github.com/jhipster/generator-jhipster/issues/3995
+                StandardRoot resources = new StandardRoot();
+                resources.setCacheMaxSize(100000);
+                resources.setCacheObjectMaxSize(4000);
+                resources.setCacheTtl(24 * 3600 * 1000);  // 1 day, in milliseconds
+                context.setResources(resources);
+
+                // Put Jasper in production mode so that JSP aren't recompiled
+                // on each request.
+                // See http://stackoverflow.com/questions/29653326/spring-boot-application-slow-because-of-jsp-compilation
+                Container jsp = context.findChild("jsp");
+                if (jsp instanceof Wrapper) {
+                    ((Wrapper)jsp).addInitParameter("development", "false");
+                }
+            });
+        }
+
+    }
+
     public static void main(String[] args) {
         SpringApplicationBuilder builder = new SpringApplicationBuilder();
         doConfigure(builder).run(args);