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cc64b583fb
easier configuration. Add an entry for the Blackdown JDK on Linux, and a note as to why the Sun JDK on Linux can't be supported at this time.
163 lines
6.2 KiB
Plaintext
163 lines
6.2 KiB
Plaintext
What is PHP4 ext/java?
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PHP4 ext/java provides a simple and effective means for creating and
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invoking methods on Java objects from PHP. The JVM is created using JNI,
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and everthing runs in-process.
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Two examples are provided, jver and jawt, to illustrate usage of this
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extension. A few things to note:
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1) new Java() will create an instance of a class if a suitable constructor
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is available. If no parameters are passed and the default constructor
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is useful as it provides access to classes like "java.lang.System"
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which expose most of their functionallity through static methods.
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2) Accessing a member of an instance will first look for bean properties
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then public fields. In other words, "print $date.time" will first
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attempt to be resolved as "$date.getTime()", then as "$date.time";
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3) Both static and instance members can be accessed on an object with
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the same syntax. Furthermore, if the java object is of type
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"java.lang.Class", then static members
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4) Exceptions raised result in PHP warnings, and null results.
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5) Overload resolution is in general a hard problem given the
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differences in types between the two languages. The PHP Java
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extension employs a simple, but fairly effective, metric for
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determining which overload is the best match.
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Additionally, method names in PHP are not case sensitive, potentially
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increasing the number of overloads to select from.
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Once a method is selected, the parameters are cooerced if necessary,
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possibly with a loss of data (example: double precision floating point
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numbers will be converted to boolean).
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Build and execution instructions:
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Given the number of platforms and providers of JVMs, no single set of
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instructions will be able to cover all cases. So in place of hard and
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fast instructions, below are a working examples for a number of free and
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commercial implementations and platforms. Please adjust the paths to
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suit your installation. Also, if you happen to get this to work on
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another JVM/platform combination, please let me know, particularly if
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a unique build or execution setup was required.
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This function has been tested in both CGI and Apache (apxs) modes. As
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the current design requires shared libraries, this support can not be
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linked statically into Apache.
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With ext/java, no Java Virtual Machines are created until the first
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Java call is made. This not only eliminates unnecessary overhead if
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the extension is never used, it also provides error messages directly
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back to the user instead of being burried in a log some place.
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For people interested in robustness, performance, and more complete
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integration with Java, consider using the sapi/servlet interface which
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is built upon the Java extension. Running PHP as a servlet enables PHP
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to utilize the existing JVM and threads from the servlet engine, and
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provides direct access to the servlet request and response objects.
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========================================================================
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=== JVM=Kaffe 1.0.4 (as delivered with OS), OS=Redhat Linux 6.1 ===
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========================================================================
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build instructions:
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./configure --with-java
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php.ini:
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[java]
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java.library.path=/usr/lib/kaffe:/home/rubys/php4/modules
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java.class.path=/usr/share/kaffe/Klasses.jar:/home/rubys/php4/modules/php_java.jar
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extension_dir=/home/rubys/php4/modules
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extension=libphp_java.so
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========================================================================
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=== JVM=Kaffe 1.0.5 (built from source), OS=Redhat Linux 6.1 ===
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========================================================================
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build instructions:
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./configure --with-java
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php.ini:
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[java]
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java.library.path=/usr/local/lib/kaffe:/home/rubys/php4/modules
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java.class.path=/usr/local/share/kaffe/Klasses.jar:/home/rubys/php4/modules/php_java.jar
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extension_dir=/home/rubys/php4/modules
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extension=libphp_java.so
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========================================================================
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=== JVM=IBM 1.1.8, OS=Redhat Linux 6.1 ===
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========================================================================
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build instructions:
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./configure --with-java
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php.ini:
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[java]
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java.class.path=/home/jdk118/lib/classes.zip:/home/rubys/php4/modules/php_java.jar
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extension_dir=/home/rubys/php4/modules
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extension=libphp_java.so
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========================================================================
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=== JVM=Blackdown 1.2.2 RC4, OS=Redhat Linux 6.1 ===
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========================================================================
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build instructions:
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./configure --with-java
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php.ini:
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[java]
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java.class.path=/home/rubys/php4/lib/php_java.jar
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extension_dir=/home/rubys/php4/modules
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extension=libphp_java.so
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========================================================================
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=== JVM=Sun JDK 1.2.2, OS=Linux ===
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========================================================================
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This compiler is not supported at this time. At the moment, only green
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threads are supported, requiring system calls to be wrapped, which is
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incompatible with the JNI Invocation API. Once native threads are
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supported, It is expected that the configuration will be identical to
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the Blackdown JDK.
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========================================================================
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=== JVM=Sun JDK 1.1.8, OS=Windows NT 4 ===
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========================================================================
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build instructions:
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SET JAVA_HOME=D:\jdk1.1.8
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msdev ext\java\java.dsp /MAKE "java - Win32 Debug_TS"
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php.ini:
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[java]
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java.class.path="D:\jdk1.1.8\lib\classes.zip;F:\PHP4\Debug_TS\php_java.jar"
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extension=php_java.dll
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========================================================================
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=== JVM=Sun JDK 1.2.2, OS=Windows NT 4 ===
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========================================================================
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build instructions:
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SET JAVA_HOME=D:\jdk1.2.2
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msdev ext\java\java.dsp /MAKE "java - Win32 Debug_TS"
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php.ini:
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[java]
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java.class.path=F:\PHP4\Debug_TS\php_java.jar
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extension=php_java.dll
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