hell_storm2004's questions

We recently moved to Tomcat from WebSphere for our application.

We are using: JDK 1.8 Build 191 and Tomcat 9.0.50. Most of the application is a mix Servlet/JSP and a few webapps with Spring MVC, it does use some multithreading

Now our test servers deploy absolutely fine. Its pretty zippy. But when deploying on Tomcat on Production, it just comes to a screeching halt.

For Example, This is an output from the Test Server:

26-Aug-2021 08:56:11.585 INFO [main] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [/opt/app/tomcat/webapps/cdsrs.war]
26-Aug-2021 08:56:13.750 INFO [main] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
26-Aug-2021 08:56:14.091 INFO [main] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [/opt/app/tomcat/webapps/cdsrs.war] has finished in [2,505] ms

And this is the same webapp on Production:

26-Aug-2021 09:26:18.016 INFO [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/app/tomcat/webapps/cdsrs]
26-Aug-2021 09:26:19.870 INFO [Catalina-utility-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
26-Aug-2021 09:28:52.569 INFO [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/opt/app/tomcat/webapps/cdsrs] has finished in [154,553] ms

I have this set on setenv.sh file:

export CATALINA_OPTS="$CATALINA_OPTS -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplicationConcurrentTime -XX:+PrintHeapAtGC -Xloggc:gc/gc.log"
export CATALINA_OPTS="$CATALINA_OPTS -Xms3072M"
export CATALINA_OPTS="$CATALINA_OPTS -Xmx8192M"
export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=3072M"

And I have configured my server.xml with:

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" maxHttpHeaderSize="65536" maxThreads="150" SSLEnabled="true" acceptorThreadCount="4" >
    <SSLHostConfig>
        <Certificate certificateKeystoreFile="conf/keystore.jks" certificateKeystorePassword="some_password" type="RSA" />
    </SSLHostConfig>
</Connector>
<Connector address="SERVER_HOSTNAME" port="8080" protocol="HTTP/1.1" maxHttpHeaderSize="65536" connectionTimeout="20000" redirectPort="8443" acceptorThreadCount="4" />

And the Engine tag like:

<Engine name="Catalina" defaultHost="localhost" startStopThreads="0">

Not to mention, the app runs very slow on it too! The page load times are gone up by about 200-300% now compared to when it ran on WebSphere. Am I missing something here? Some help on this would be really appreciated. Thanks!

We are in the process of migrating our application from Websphere to Tomcat. One thing I have noticed is that when I issue the shutdown.sh for Tomcat, the process still keeps running. Initially I thought the process would end itself in a minute or two, but even after 5 minutes I still see the process alive. So I have to kill the process using kill -9 and then go for a start.

While shutting down I do see a lot of errors getting thrown on the console like:

org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [some_application] appears to have started a thread named [Timer-0] but has failed to stop it.

The code consists of webapps which are made a mix of servlets, spring and a whole bunch of threads are started when the application boots up.

Is there something I can do configuration-wise that would take care of this? Or this needs some code-work to compensate for something that WebSphere provided out-of-the-box?

I currently work on an excruciatingly slow remote machine and on Tomcat. So, I was wondering, Tomcat comes with some pre-packaged webapps like:

docs
examples
host-manager
manager
ROOT

Now I just wanted to know, can I delete docs and examples from the webapps folder without harming the server? I would assume that the other three webapps do serve some important purpose. All in all, if I do remove them, it will save me about 2.5 minutes on average every time I start the server.

I'm not sure if this is the right place to ask this, but I'll go ahead anyway! I am trying to deploy a JAR that I built with maven into the Tomcat/lib folder. The problem I'm having is that all the classpath JARs for the JAR that I built, aren't getting read. So I am having to explicitly add those JARs to Tomcat's lib folder as well. Is this the expected behavior for Tomcat? Or am I doing something wrong with the Maven build/plugins? My JAR and classpath plugins are done like:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <inherited>true</inherited>
    <configuration>
        <archive>
            <manifest>
                <addClasspath>true</addClasspath>
                <addDefaultEntries>true</addDefaultEntries>
                <addBuildEnvironmentEntries>true</addBuildEnvironmentEntries>
                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
                <classpathPrefix>lib/</classpathPrefix>
            </manifest>
        </archive>
        <attachClasses>true</attachClasses>
        <includeEmptyDirectories>true</includeEmptyDirectories>
        <outputDirectory>${project.basedir}\target</outputDirectory>
    </configuration>
</plugin>

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <inherited>false</inherited>
    <executions>
        <execution>
            <id>pal-copy-dependencies</id>
            <phase>generate-sources</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <inherited>false</inherited>
            <configuration>
                <excludeScope>provided</excludeScope>
                <excludeClassifiers>shared</excludeClassifiers>
                <excludeTransitive>true</excludeTransitive>
                <outputDirectory>${project.build.directory}/classes/lib</outputDirectory>
                <overWriteIfNewer>true</overWriteIfNewer>
                <silent>true</silent>
                <useBaseVersion>false</useBaseVersion>
            </configuration>
        </execution>
    </executions>
</plugin>

For example, if I have the dependency:

<dependency>
    <groupId>org.jasypt</groupId>
    <artifactId>jasypt</artifactId>
    <version>1.9.3</version>
</dependency>

I keep getting the error:

09-Jan-2020 16:33:40.347 SEVERE [main] org.apache.catalina.core.ApplicationContext.log Servlet.init() for servlet [InitialiseDAC] threw exception
java.lang.NoClassDefFoundError: org/jasypt/util/text/AES256TextEncryptor
    at com.provisioning.common.crypto.Decrypt.doDecrypt(Decrypt.java:192)

It only works when I make the dependency like:

<dependency>
    <groupId>org.jasypt</groupId>
    <artifactId>jasypt</artifactId>
    <version>1.9.3</version>
    <scope>provided</scope>
</dependency>

And put the jasypt.jar in the Tomcat's lib folder.

Is this normal for Tomcat?

I am trying to run Tomcat 9. I have configured it to run with SSL. So when I am accessing the tomcat URL with:

https://localhost:8443/manager/html

It works fine. But when I try to run it with my computer name I get the 403 error saying I should rectify my tomcat-users.xml. I have the XML fine setup just fine. But not sure what to do in this case. I have setup the hosts file with my computer name entry.

Is there any more setting that i need to do in order get it to work?

My users file has these entries:

<role rolename="admin-gui"/>
<role rolename="manager-gui"/>
<role rolename="manager-jmx"/>
<role rolename="manager-script"/>
<role rolename="manager-status"/>

<user password="admin" roles="manager-gui,admin-gui" username="admin"/>

I have attached the error screen as well.

Tomcat error