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.TH "JDEPRSCAN" "1" "2018" "JDK 13" "JDK Commands"

.hy

.SH NAME

.PP

jdeprscan \- static analysis tool that scans a jar file (or some other

aggregation of class files) for uses of deprecated API elements

.SH SYNOPSIS

.PP

\f[CB]jdeprscan\f[R] [\f[I]options\f[R]]

{\f[I]dir\f[R]|\f[I]jar\f[R]|\f[I]class\f[R]}

.TP

.B \f[I]options\f[R]

See \f[B]Options for the jdeprscan Command\f[R]

.RS

.RE

.TP

.B \f[I]dir\f[R]|\f[I]jar\f[R]|\f[I]class\f[R]

\f[CB]jdeprscan\f[R] command scans each argument for usages of deprecated

APIs.

The arguments can be a:

.RS

.IP \[bu] 2

\f[I]dir\f[R]: Directory

.IP \[bu] 2

\f[I]jar\f[R]: JAR file

.IP \[bu] 2

\f[I]class\f[R]: Class name or class file

.PP

The class name should use a dot (\f[CB]\&.\f[R]) as a separator.

For example:

.PP

\f[CB]java.lang.Thread\f[R]

.PP

For nested classes, the dollar sign \f[CB]$\f[R] separator character

should be used.

For example:

.PP

\f[CB]java.lang.Thread$State\f[R]

.PP

A class file can also be named.

For example:

.PP

\f[CB]build/classes/java/lang/Thread$State.class\f[R]

.RE

.SH DESCRIPTION

.PP

The \f[CB]jdeprscan\f[R] tool is a static analysis tool provided by the

JDK that scans a JAR file or some other aggregation of class files for

uses of deprecated API elements.

The deprecated APIs identified by the \f[CB]jdeprscan\f[R] tool are only

those that are defined by Java SE.

Deprecated APIs defined by third\-party libraries aren\[aq]t reported.

.PP

To scan a JAR file or a set of class files, you must first ensure that

all of the classes that the scanned classes depend upon are present in

the class path.

Set the class path using the \f[CB]\-\-class\-path\f[R] option described

in \f[B]Options for the jdeprscan Command\f[R].

Typically, you would use the same class path as the one that you use

when invoking your application.

.PP

If the \f[CB]jdeprscan\f[R] can\[aq]t find all the dependent classes, it

will generate an error message for each class that\[aq]s missing.

These error messages are typically of the form:

.RS

.PP

\f[CB]error:\ cannot\ find\ class\ ...\f[R]

.RE

.PP

If these errors occur, then you must adjust the class path so that it

includes all dependent classes.

.SH OPTIONS FOR THE JDEPRSCAN COMMAND

.PP

The following options are available:

.TP

.B \f[CB]\-\-class\-path\f[R] \f[I]path\f[R]

Provides a search path for resolution of dependent classes.

.RS

.PP

\f[I]path\f[R] can be a search path that consists of one or more

directories separated by the system\-specific path separator.

For example:

.IP \[bu] 2

\f[B]Oracle Solaris, Linux, and OS X:\f[R]

.RS 2

.RS

.PP

\f[CB]\-\-class\-path\ /some/directory:/another/different/dir\f[R]

.RE

.RE

.PP

\f[B]Note:\f[R]

.PP

On Windows, use a semicolon (\f[CB];\f[R]) as the separator instead of a

colon (\f[CB]:\f[R]).

.IP \[bu] 2

\f[B]Windows:\f[R]

.RS 2

.RS

.PP

\f[CB]\-\-class\-path\ \\some\\directory;\\another\\different\\dir\f[R]

.RE

.RE

.RE

.TP

.B \f[CB]\-\-for\-removal\f[R]

Limits scanning or listing to APIs that are deprecated for removal.

Can\[aq]t be used with a release value of 6, 7, or 8.

.RS

.RE

.TP

.B \f[CB]\-\-full\-version\f[R]

Prints out the full version string of the tool.

.RS

.RE

.TP

.B \f[CB]\-\-help\f[R] or \f[CB]\-h\f[R]

Prints out a full help message.

.RS

.RE

.TP

.B \f[CB]\-\-list\f[R] or \f[CB]\-l\f[R]

Prints the set of deprecated APIs.

No scanning is done, so no directory, jar, or class arguments should be

provided.

.RS

.RE

.TP

.B \f[CB]\-\-release\f[R] \f[CB]6\f[R]|\f[CB]7\f[R]|\f[CB]8\f[R]|\f[CB]9\f[R]

Specifies the Java SE release that provides the set of deprecated APIs

for scanning.

.RS

.RE

.TP

.B \f[CB]\-\-verbose\f[R] or \f[CB]\-v\f[R]

Enables additional message output during processing.

.RS

.RE

.TP

.B \f[CB]\-\-version\f[R]

Prints out the abbreviated version string of the tool.

.RS

.RE

.SH EXAMPLE OF JDEPRSCAN OUTPUT

.PP

The JAR file for this library will be named something similar to

\f[CB]commons\-math3\-3.6.1.jar\f[R].

To scan this JAR file for the use of deprecated APIs, run the following

command:

.RS

.PP

\f[CB]jdeprscan\ commons\-math3\-3.6.1.jar\f[R]

.RE

.PP

This command produces several lines of output.

For example, one line of output might be:

.IP

.nf

\f[CB]

class\ org/apache/commons/math3/util/MathUtils\ uses\ deprecated\ method\ java/lang/Double::<init>(D)V

\f[R]

.fi

.PP

\f[B]Note:\f[R]

.PP

The class name is specified using the slash\-separated binary name as

described in JVMS 4.2.1.

This is the form used internally in class files.

.PP

The deprecated API it uses is a method on the \f[CB]java.lang.Double\f[R]

class.

.PP

The name of the deprecated method is \f[CB]<init>\f[R], which is a special

name that means that the method is actually a constructor.

Another special name is \f[CB]<clinit>\f[R], which indicates a class

static initializer.

.PP

Other methods are listed just by their method name.

Following the method name is the argument list and return type:

.RS

.PP

\f[CB](D)V\f[R]

.RE

.PP

This indicates that it takes just one double value (a primitive) and

returns void.

The argument and return types can become cryptic.

For example, another line of output might be:

.IP

.nf

\f[CB]

class\ org/apache/commons/math3/util/Precision\ uses\ deprecated\ method\ java/math/BigDecimal::setScale(II)Ljava/math/BigDecimal;

\f[R]

.fi

.PP

In this line of output, the deprecated method is on class

\f[CB]java.math.BigDecimal\f[R], and the method is \f[CB]setScale()\f[R].

In this case, the \f[CB](II)\f[R] means that it takes two \f[CB]int\f[R]

arguments.

The \f[CB]Ljava/math/BigDecimal;\f[R] after the parentheses means that it

returns a reference to \f[CB]java.math.BigDecimal\f[R].

.SH JDEPRSCAN ANALYSIS CAN BE VERSION\-SPECIFIC

.PP

You can use \f[CB]jdeprscan\f[R] relative to the previous three JDK

releases.

For example, if you are running JDK 9, then you can check against JDK 8,

7, and 6.

.PP

As an example, look at this code snippet:

.IP

.nf

\f[CB]

public\ class\ Deprecations\ {

\ \ \ SecurityManager\ sm\ =\ new\ RMISecurityManager();\ \ \ \ //\ deprecated\ in\ 8

\ \ \ Boolean\ b2\ =\ new\ Boolean(true);\ \ \ \ \ \ \ \ \ \ //\ deprecated\ in\ 9

}

\f[R]

.fi

.PP

The complete class compiles without warnings in JDK 7.

.PP

If you run \f[CB]jdeprscan\f[R] on a system with JDK 9, then you see:

.IP

.nf

\f[CB]

$\ jdeprscan\ \-\-class\-path\ classes\ \-\-release\ 7\ example.Deprecations

(no\ output)

\f[R]

.fi

.PP

Run \f[CB]jdeprscan\f[R] with a release value of 8:

.IP

.nf

\f[CB]

$\ jdeprscan\ \-\-class\-path\ classes\ \-\-release\ 8\ example.Deprecations

class\ example/Deprecations\ uses\ type\ java/rmi/RMISecurityManager\ deprecated

class\ example/Deprecations\ uses\ method\ in\ type\ java/rmi/RMISecurityManager\ deprecated

\f[R]

.fi

.PP

Run \f[CB]jdeprscan\f[R] on JDK 9:

.IP

.nf

\f[CB]

$\ jdeprscan\ \-\-class\-path\ classes\ example.Deprecations

class\ example/Deprecations\ uses\ type\ java/rmi/RMISecurityManager\ deprecated

class\ example/Deprecations\ uses\ method\ in\ type\ java/rmi/RMISecurityManager\ deprecated

class\ example/Deprecations\ uses\ method\ java/lang/Boolean\ <init>\ (Z)V\ deprecated

\f[R]

.fi