RELEASE-NOTES
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- Apache Tomcat Version @VERSION@
- Release Notes
- $Id: RELEASE-NOTES,v 1.25 2005/01/19 20:30:26 remm Exp $
- =============================
- KNOWN ISSUES IN THIS RELEASE:
- =============================
- * Dependency Changes
- * JNI Based Applications
- * Bundled APIs
- * Web application reloading and static fields in shared libraries
- * Tomcat on Linux
- * Enabling SSI and CGI Support
- * Security manager URLs
- * Symlinking static resources
- * Enabling invoker servlet
- * Viewing the Tomcat Change Log
- * When all else fails
- ===================
- Dependency Changes:
- ===================
- Tomcat 5.5 is designed to run on J2SE 5.0 and later, and requires
- configuration to run on J2SE 1.4. Make sure to read the "RUNNING.txt"
- file in this directory if you are using J2SE 1.4.
- In addition, Tomcat 5.5 uses the Eclipse JDT Java compiler for compiling
- JSP pages. This means you no longer need to have the complete
- Java Development Kit (JDK) to run Tomcat, but a Java Runtime Environment
- (JRE) is sufficient. The Eclipse JDT Java compiler is bundled with the
- binary Tomcat distributions. Tomcat can also be configured to use the
- compiler from the JDK to compile JSPs, or any other Java compiler supported
- by Apache Ant.
- =======================
- JNI Based Applications:
- =======================
- Applications that require native libraries must ensure that the libraries have
- been loaded prior to use. Typically, this is done with a call like:
- static {
- System.loadLibrary("path-to-library-file");
- }
- in some class. However, the application must also ensure that the library is
- not loaded more than once. If the above code were placed in a class inside
- the web application (i.e. under /WEB-INF/classes or /WEB-INF/lib), and the
- application were reloaded, the loadLibrary() call would be attempted a second
- time.
- To avoid this problem, place classes that load native libraries outside of the
- web application, and ensure that the loadLibrary() call is executed only once
- during the lifetime of a particular JVM.
- =============
- Bundled APIs:
- =============
- A standard installation of Tomcat 5.5 makes all of the following APIs available
- for use by web applications (by placing them in "common/lib" or "shared/lib"):
- * commons-el.jar (Commons Expression Language 1.0)
- * commons-logging-api.jar (Commons Logging API 1.0.x)
- * jasper-compiler.jar (Jasper 2 Compiler)
- * jasper-compiler-jdt.jar (Eclipse JDT Java compiler)
- * jasper-runtime.jar (Jasper 2 Runtime)
- * jsp-api.jar (JSP 2.0 API)
- * naming-common.jar (JNDI Context implementation)
- * naming-factory.jar (JNDI object factories for J2EE ENC support)
- * naming-factory-dbcp.jar (DataSource implementation based on commons-dbcp)
- * naming-resources.jar (JNDI DirContext implementations)
- * servlet-api.jar (Servlet 2.4 API)
- Installing the compatibility package will add the following to the list, which are
- needed when running on J2SE 1.4:
- * jmx.jar (Java Management Extensions API 1.2 or later)
- * xercesImpl.jar (Xerces XML Parser, version 2.6.2 or later)
- You can make additional APIs available to all of your web applications by
- putting unpacked classes into a "classes" directory (not created by default),
- or by placing them in JAR files in the "lib" directory.
- To override the XML parser implementation or interfaces, use the endorsed
- mechanism of the JVM. The default configuration defines JARs located in
- "common/endorsed" as endorsed.
- ================================================================
- Web application reloading and static fields in shared libraries:
- ================================================================
- Some shared libraries (many are part of the JDK) keep references to objects
- instantiated by the web application. To avoid class loading related problems
- (ClassCastExceptions, messages indicating that the classloader
- is stopped, etc.), the shared libraries state should be reinitialized.
- Something which might help is to avoid putting classes which would be
- referenced by a shared static field in the web application classloader,
- and putting them in the shared classloader instead (JARs should be put in the
- "lib" folder, and classes should be put in the "classes" folder).
- ================
- Tomcat on Linux:
- ================
- GLIBC 2.2 / Linux 2.4 users should define an environment variable:
- export LD_ASSUME_KERNEL=2.2.5
- Redhat Linux 9.0 users should use the following setting to avoid
- stability problems:
- export LD_ASSUME_KERNEL=2.4.1
- =============================
- Enabling SSI and CGI Support:
- =============================
- Because of the security risks associated with CGI and SSI available
- to web applications, these features are disabled by default.
- To enable and configure CGI support, please see the cgi-howto.html page.
- To enable and configue SSI support, please see the ssi-howto.html page.
- ======================
- Security manager URLs:
- ======================
- In order to grant security permissions to JARs located inside the
- web application repository, use URLs of of the following format
- in your policy file:
- file:${catalina.home}/webapps/examples/WEB-INF/lib/driver.jar
- ============================
- Symlinking static resources:
- ============================
- By default, Unix symlinks will not work when used in a web application to link
- resources located outside the web application root directory.
- This behavior is optional, and the "allowLinking" flag may be used to disable
- the check.
- =========================
- Enabling invoker servlet:
- =========================
- Starting with Tomcat 4.1.12, the invoker servlet is no longer available by
- default in all webapps. Enabling it for all webapps is possible by editing
- $CATALINA_HOME/conf/web.xml to uncomment the "/servlet/*" servlet-mapping
- definition.
- Using the invoker servlet in a production environment is not recommended and
- is unsupported. More details are available on the Tomcat FAQ at
- http://jakarta.apache.org/tomcat/faq/misc.html#invoker.
- ==============================
- Viewing the Tomcat Change Log:
- ==============================
- See changelog.html in this directory.
- ====================
- When all else fails:
- ====================
- See the FAQ
- http://jakarta.apache.org/tomcat/faq/