How to Configure SSL Certificate in Tomcat

By RahulJune 25, 20183 Mins Read

We are assuming that you already have installed working Tomcat server in your system. If not you can visit to earlier article Install Tomcat 7 on CentOS, RHEL or Ubuntu, Debian Systems. This article can be used for Linux as well as Windows hosts both, the only thing we need to change directory path of keystore.

Step 1 – Create a Keystore

A Java KeyStore (JKS) is a repository of security certificates. keytool is the command line utility for creating and managing keystore. This command is available with JDK and JRE both. We just need to make sure that JDK or JRE is configured with PATH environment variable.

keytool -genkey -alias svr1.tecadmin.net -keyalg RSA -keystore /etc/pki/keystore

[Samle Output]

Enter keystore password:
Re-enter new password:
What is your first and last name?
  [Unknown]:  Rahul Kumar
What is the name of your organizational unit?
  [Unknown]:  Web
What is the name of your organization?
  [Unknown]:  TecAdmin Inc.
What is the name of your City or Locality?
  [Unknown]:  Delhi
What is the name of your State or Province?
  [Unknown]:  Delhi
What is the two-letter country code for this unit?
  [Unknown]:  IN
Is CN=Rahul Kumar, OU=Web, O=TecAdmin Inc., L=Delhi, ST=Delhi, C=IN correct?
  [no]:  yes

Enter key password for 
        (RETURN if same as keystore password):
Re-enter new password:

Step 2 – Get CA Signed SSL [ Ignore SelfSigned Users ]

You don’t need to do this step if you are going to use self-signed SSL certificate. If you want to purchase a valid ssl from certificate authorities, then you need to first create a CSR, Use the following command to do it.

Create CSR:

keytool -certreq -keyalg RSA -alias svr1.tecadmin.net -file svr1.csr -keystore /etc/pki/keystore

Above command will prompt for keystore password and generate the CSR file. Use this CSR and purchase ssl certificate from any certificate authorities.

After issued certificate by CA, you will have following files – root certificate, intermediate certificate, and certificate file. In my case the filenames are

A. root.crt (root certificate)
B. intermediate.crt (intermediate certificate)
C. svr1.tecadmin.net.crt ( Issued certificate by CA )

Install the root certificate:

keytool -import -alias root -keystore /etc/pki/keystore -trustcacerts -file root.crt

Install the intermediate certificate:

keytool -import -alias intermed -keystore /etc/pki/keystore -trustcacerts -file intermediate.crt

Install the issued certificate:

keytool -import -alias svr1.tecadmin.net -keystore /etc/pki/keystore -trustcacerts -file svr1.tecadmin.net.crt

Step 3 – Setup Tomcat Keystore

Now go to your Tomcat installation directory and edit conf/server.xml file in your favorite editor and update the configuration as below. You may also change the port from 8443to some other port if required.

    <Connector port="8443" protocol="HTTP/1.1"
                connectionTimeout="20000"
                redirectPort="8443"
                SSLEnabled="true"
                scheme="https"
                secure="true"
                sslProtocol="TLS"
                keystoreFile="/etc/pki/keystore"
                keystorePass="_password_" />

Step 4 – Restart Tomcat

Use your init script (if have) to restart tomcat service, In my case i use shell scripts (startup.sh and shutdown.sh) for stopping and starting tomcat.

./bin/shutdown.sh
./bin/startup.sh

Step 5 – Verify Setup

As we have done all the required configuration for tomcat setup. lets access tomcat in your browser on the configured port in step 2.

Note: This article has been tested with Tomcat 7 on CentOS 6.5 using Java 8.

View 18 Comments

18 Comments

jitendra on December 9, 2022 12:29 pm
Hi,
Can you please help me this step how i come.
Install the issued certificate:
Reply
pooja on May 4, 2022 7:16 am
hello
i got three certificates from godaddy
1) number.pem
2)number.crt
3)bundle.crt
can anyone help me to install on centos
Reply
sudhir bolisetty on October 13, 2021 3:47 pm
Hi Rahul,
I have imported CA signed certificate in keystore file and mapped it in server.xml, getting protocol error . please suggest.
Cmd used to import certificate into keystore:
/usr/java/jdk1.8.0_301-amd64/jre/bin/keytool -import -alias XXXXXXXXXX -keystore /opt/fis/tomcat-bnbkuatrib-9.0.48/pki_cert/keystore -trustcacerts -file pki_cert
=============================================================================================

<!– Security listener. Documentation at /docs/config/listeners.html
–>

<!–
–>

<!–
–>

<!–
–>

<!–
–>

<!–
–>
<!– You should set jvmRoute to support load-balancing via AJP ie :
–>

<!–
–>

<!–
–>
=============================================================================================
error:
——-
13-Oct-2021 20:28:34.677 SEVERE [main] org.apache.catalina.util.LifecycleBase.handleSubClassException Failed to initialize component [Connector[HTTP/1.1-9940]]
org.apache.catalina.LifecycleException: Protocol handler initialization failed
at org.apache.catalina.connector.Connector.initInternal(Connector.java:1049)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at org.apache.catalina.core.StandardService.initInternal(StandardService.java:561)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:1049)
at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:136)
at org.apache.catalina.startup.Catalina.load(Catalina.java:724)
at org.apache.catalina.startup.Catalina.load(Catalina.java:746)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:305)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:475)
Caused by: java.lang.IllegalArgumentException: Alias name [null] does not identify a key entry
at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:99)
at org.apache.tomcat.util.net.AbstractJsseEndpoint.initialiseSsl(AbstractJsseEndpoint.java:71)
at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:232)
at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1208)
at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:1221)
at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:603)
at org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:80)
at org.apache.catalina.connector.Connector.initInternal(Connector.java:1046)
… 13 more
Caused by: java.io.IOException: Alias name [null] does not identify a key entry
at org.apache.tomcat.util.net.SSLUtilBase.getKeyManagers(SSLUtilBase.java:349)
at org.apache.tomcat.util.net.SSLUtilBase.createSSLContext(SSLUtilBase.java:246)
at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:97)
… 20 more
13-Oct-2021 20:28:34.678 INFO [main] org.apache.catalina.startup.Catalina.load Server initialization in [589] milliseconds
Reply
Mayank Parekh on July 8, 2021 1:12 am
Hello Rahul,
I am getting error message:
This CA Root certificate is not trusted because it is not in the Trusted Root Certification Authorities store.
To enable trust install this certificate in Trusted Root Certificate Authorities store.
How to find Trusted Root Certificate Authorities store path or location?
How can I store in correct place
Reply
Ram Badduri on January 13, 2021 1:59 am
Hello Rahul,
Thank you for this tutorial. I tried the steps as above, but my webpage still showing ‘self-signed cert’. Says it is invalid.
Please help.
Reply
Tatsuya on January 6, 2021 1:40 am
Hi Rahul,
I am Tatsuya from Japan.
Thanks for your nice article.
I am trying the steps, but currently stuck.
My situation is written in the following question
https://stackoverflow.com/questions/65515892/redirect-http-to-https-using-tomcat-is-not-working/65517729#65517729
Would you please help me ?
Reply
neetu on September 22, 2020 10:34 am
Hi Rahul,
We have a company provided SSL certificate and need to imolement the same on tomcat.
I have created a keystore file as
“keytool -genkey -alias star_comp_co_in -keyalg RSA -keystore C:\SSL\myserver.keystore”
Cert files received from Client are:
2021sslcertificate withkey filetype:Personal Information Exchange
DigiCertCA.crt Security Certificate
star_comp_co_in Security Certificate
TrustedRoot.crt Security Certificate
I am running keytool command as
for importing TrustedRoot.crt:
keytool -import -alias root -keystore C:\SSL\myserver -trustcacerts -file C:\Certfiles\TrustedRoot.crt
Gettings error as
keytool error: java.io.FileNotFoundException: C\Certfiles\TrustedRoot.crt (The system can not find the file specified).
I am not able to run any of the import commands suggested here.
Please help.
Neetu
Reply
- Rahul on September 22, 2020 12:49 pm
  Try the trusted certificate path as: C:\\Certfiles\\TrustedRoot.crt
  Reply
venkat on July 2, 2019 5:26 am
Hi,
How to Extending expiration date of trustedCertEntry within a keystore
Reply
shakti on June 3, 2019 9:31 am
hello,
I have some issue .how to get the .key file
Reply
Manoj on April 1, 2019 2:27 pm
Thank you Rahul. The article very informative. Could you please also let us know In Step 3 how to use encrypted password for keystorePass.
Reply
Carlos Daniel Cañón Carrero on September 15, 2018 12:40 am
Thank you very much…
It works for me 😀
Reply
Mohammed Anees on June 28, 2018 6:36 am
Hi All, From the last screen shot i see RED cross mark on HTTPS ? Why still this is coming ?
Any ideas ?
Thanks and Regards,
Mohammed Anees
Reply
- Rahul K. on June 29, 2018 1:52 am
  Hi Anees,
  for this tutorial, I have used self singed ssl certificate. That’s why its shows red cross.
  Reply
sac on June 22, 2018 10:54 am
Hi Rahul,
I am trying to enable Https by installing ssl in my centOS 7 tomcat server. I have received ssl certificate from Godaddy but while creating csr I have used “openssl req -new -newkey rsa:2048 -nodes -keyout myperimetrix.key -out myperimetrix.csr Generating a 2048 bit RSA private key” command to generate csr and no idea about how to proceed. your commands looks very easy to me to install, so trying to follow you. Now should i need to regenerate csr to install ssl? is it possible to run all these commands outside root as i don’t want to disturb my server?
Reply
- Rahul K. on June 25, 2018 7:14 am
  Hi Sachin,
  As you wrote, you already get an certificate from Godaddy. So you must have CSR and Private key used to issue certificate from Godaddy. You can use the same for installing on your Tomcat.
  In case you lost the Private key and CSR. You need generate a new Private and CSR on your system and then ReKey your certificate on Godaddy.
  Reply
arun on October 4, 2017 11:31 am
good one.thankss
Reply
Jonathan on June 22, 2014 3:30 am
Thank you very much for this tutorial. I want to configure my tomcat instance in order to get only SSL access to my webapps, so I’m following your instructions, however I can’t be able to connect trought 8443 or https port/protocol, only the regular 8080 it’s active. I want to use a SelfSigned certificate in order to see if SSL work and then buy a trusted certificate but in your instructions I can see that you import the trusted certificate, is not necessary to create the SelfSigned certificate and import it as well? Thanks in advance for your support to this noob.
Reply