Findbugs Предупреждения по образцу

Описания ошибок FindBugs ™ в онлайн-документации кратки и хорошо написаны. К сожалению, некоторые части описаний нелегко понять (даже для опытных разработчиков Java). Может быть трудно понять точную причину предупреждения и / или найти правильный способ устранения.

Если честно — по крайней мере у меня были проблемы с некоторыми предупреждениями в последние годы. Довольно часто я не находил полезного примера кода в сети. Основным недостатком описания ошибок является то, что он редко использует пример кода для демонстрации неправильной и правильной ситуации. Это моя мотивация опубликовать в ближайшие недели серию статей с простыми примерами кода выбранных предупреждений.

Следующие 10 предупреждений рассматриваются в этой статье:

BC_IMPOSSIBLE_CAST
BC_IMPOSSIBLE_DOWNCAST
BC_IMPOSSIBLE_INSTANCEOF
BC_IMPOSSIBLE_DOWNCAST_OF_TOARRAY
DMI_BIGDECIMAL_CONSTRUCTED_FROM_DOUBLE
ES_COMPARING_STRINGS_WITH_EQ
VA_FORMAT_STRING_ILLEGAL
RV_RETURN_VALUE_IGNORED NP_ALWAYS_NULL QBA_QUESTIONABLE_BOOLEAN_ASSIGNMENT

Следующий пример был скомпилирован с JDK 1.6.0_24, и Findbugs ™ (версия 2.0.1-rc2) покажет все предупреждения с настройками по умолчанию для плагина Findbugs ™ Eclipse (версия 2.0.1.20120511).

package com.sprunck.samples;
 
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.UnknownFormatConversionException;
 
@SuppressWarnings(value = { "null", "unused" })
public class FindbugsWarningsBySampleFirst {
 
    public static void main(final String[] args) {
 
        System.out.println("Findbugs Sample 001 for BC_IMPOSSIBLE_CAST");
        // WRONG
        try {
            FindbugsWarningsBySampleFirst.bcImpossibleCastWRONG();
        } catch (final ClassCastException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        // CORRECT
        FindbugsWarningsBySampleFirst.bcImpossibleCastCORRECT();
 
        System.out.println("Findbugs Sample 002 for BC_IMPOSSIBLE_DOWNCAST");
        // WRONG
        try {
            FindbugsWarningsBySampleFirst.bcImpossibleDowncastWRONG();
        } catch (final ClassCastException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        // CORRECT
        FindbugsWarningsBySampleFirst.bcImpossibleDowncastCORRECT();
 
        System.out.println("Findbugs Sample 003 for BC_IMPOSSIBLE_INSTANCEOF");
        // WRONG
        FindbugsWarningsBySampleFirst.bcImpossibleInstanceOfWRONG();
        // CORRECT
        FindbugsWarningsBySampleFirst.bcImpossibleInstanceOfCORRECT();
 
        System.out.println("Findbugs Sample 004 for BC_IMPOSSIBLE_DOWNCAST_OF_TOARRAY");
        // WRONG
        try {
            FindbugsWarningsBySampleFirst.bcImpossibleDowncastOfArrayWRONG();
        } catch (final ClassCastException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        // CORRECT
        FindbugsWarningsBySampleFirst.bcImpossibleDowncastOfArrayCORRECT();
 
        System.out.println("Findbugs Sample 005 for DMI_BIGDECIMAL_CONSTRUCTED_FROM_DOUBLE");
        // WRONG
        FindbugsWarningsBySampleFirst.dmiBigDecimalConstructedFromDoubleWRONG();
        // CORRECT
        FindbugsWarningsBySampleFirst.dmiBigDecimalConstructedFromDoubleCORRECT();
 
        System.out.println("Findbugs Sample 006 for ES_COMPARING_STRINGS_WITH_EQ");
        // WRONG
        FindbugsWarningsBySampleFirst.esComparingStringsWithEqWRONG();
        // CORRECT
        FindbugsWarningsBySampleFirst.esComparingStringsWithEqCORRECT();
 
        System.out.println("Findbugs Sample 007 for VA_FORMAT_STRING_ILLEGAL");
        // WRONG
        try {
            FindbugsWarningsBySampleFirst.vaFormatStringIllegalWRONG();
        } catch (final UnknownFormatConversionException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        // CORRECT
        FindbugsWarningsBySampleFirst.vaFormatStringIllegalCORRECT();
 
        System.out.println("Findbugs Sample 008 for RV_RETURN_VALUE_IGNORED");
        // WRONG
        FindbugsWarningsBySampleFirst.rvReturnValueIgnoredWRONG();
        // CORRECT
        FindbugsWarningsBySampleFirst.rvReturnValueIgnoredCORRECT();
 
        System.out.println("Findbugs Sample 009 for NP_ALWAYS_NULL");
        // WRONG
        try {
            FindbugsWarningsBySampleFirst.npAlwaysNullWRONG();
        } catch (final NullPointerException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        // CORRECT
        FindbugsWarningsBySampleFirst.npAlwaysNullCORRECT();
 
        System.out.println("Findbugs Sample 010 for QBA_QUESTIONABLE_BOOLEAN_ASSIGNMENT");
        // WRONG
        FindbugsWarningsBySampleFirst.qabQuestionableBooleanAssignmentWRONG();
        // CORRECT
        FindbugsWarningsBySampleFirst.qabQuestionableBooleanAssignmentCORRECT();
 
    }
 
    private static void bcImpossibleCastWRONG() {
        final Object doubleValue = Double.valueOf(1.0);
        final Long value = (Long) doubleValue;
        System.out.println("   - " + value);
    }
 
    private static void bcImpossibleCastCORRECT() {
        final Object doubleValue = Double.valueOf(1.0);
        final Double value = (Double) doubleValue;
        System.out.println("   - " + value);
    }
 
    private static void bcImpossibleDowncastWRONG() {
        final Object exception = new RuntimeException("abc");
        final SecurityException value = (SecurityException) exception;
        System.out.println("   - " + value.getMessage());
    }
 
    private static void bcImpossibleDowncastCORRECT() {
        final Object exception = new RuntimeException("abc");
        final RuntimeException value = (RuntimeException) exception;
        System.out.println("   - " + value.getMessage());
    }
 
    private static void bcImpossibleInstanceOfWRONG() {
        final Object value = Double.valueOf(1.0);
        System.out.println("   - " + (value instanceof Long));
    }
 
    private static void bcImpossibleInstanceOfCORRECT() {
        final Object value = Double.valueOf(1.0);
        System.out.println("   - " + (value instanceof Double));
    }
 
    private static void bcImpossibleDowncastOfArrayWRONG() {
        final Collection<String> stringVector = new ArrayList<String>();
        stringVector.add("abc");
        stringVector.add("xyz");
        final String[] stringArray = (String[]) stringVector.toArray();
        System.out.println("   - " + stringArray.length);
    }
 
    private static void bcImpossibleDowncastOfArrayCORRECT() {
        final Collection<String> stringVector = new ArrayList<String>();
        stringVector.add("abc");
        stringVector.add("xyz");
        final String[] stringArray = stringVector.toArray(new String[stringVector.size()]);
        System.out.println("   - " + stringArray.length);
    }
 
    private static void dmiBigDecimalConstructedFromDoubleWRONG() {
        final BigDecimal bigDecimal = new BigDecimal(3.1);
        System.out.println("   - " + bigDecimal.toString());
    }
 
    private static void dmiBigDecimalConstructedFromDoubleCORRECT() {
        final BigDecimal bigDecimal = new BigDecimal("3.1");
        System.out.println("   - " + bigDecimal.toString());
    }
 
    private static void esComparingStringsWithEqWRONG() {
        final StringBuilder sb1 = new StringBuilder("1234");
        final StringBuilder sb2 = new StringBuilder("1234");
        final String string1 = sb1.toString();
        final String string2 = sb2.toString();
        System.out.println("   - " + (string1 == string2));
    }
 
    private static void esComparingStringsWithEqCORRECT() {
        final StringBuilder sb1 = new StringBuilder("1234");
        final StringBuilder sb2 = new StringBuilder("1234");
        final String string1 = sb1.toString();
        final String string2 = sb2.toString();
        System.out.println("   - " + string1.equals(string2));
    }
 
    private static void vaFormatStringIllegalWRONG() {
        System.out.println(String.format("   - %>s  %s", "10", "9"));
    }
 
    private static void vaFormatStringIllegalCORRECT() {
        System.out.println(String.format("   - %s > %s", "10", "9"));
    }
 
    private static void rvReturnValueIgnoredWRONG() {
        final BigDecimal bigDecimal = BigDecimal.ONE;
        bigDecimal.add(BigDecimal.ONE);
        System.out.println(String.format("   - " + bigDecimal));
    }
 
    private static void rvReturnValueIgnoredCORRECT() {
        final BigDecimal bigDecimal = BigDecimal.ONE;
        final BigDecimal newValue = bigDecimal.add(BigDecimal.ONE);
        System.out.println(String.format("   - " + newValue));
    }
 
    private static void npAlwaysNullWRONG() {
        final String value = null;
        if (null != value & value.length() > 2) {
            System.out.println(String.format("   - " + value));
        } else {
            System.out.println(String.format("   - value is invalid"));
        }
    }
 
    private static void npAlwaysNullCORRECT() {
        final String value = null;
        if (null != value && value.length() > 2) {
            System.out.println(String.format("   - " + value));
        } else {
            System.out.println(String.format("   - value is invalid"));
        }
    }
 
    private static void qabQuestionableBooleanAssignmentWRONG() {
        boolean value = false;
        if (value = true) {
            System.out.println(String.format("   - value is true"));
        } else {
            System.out.println(String.format("   - value is false"));
        }
    }
 
    private static void qabQuestionableBooleanAssignmentCORRECT() {
        final boolean value = false;
        if (value == true) {
            System.out.println(String.format("   - value is true"));
        } else {
            System.out.println(String.format("   - value is false"));
        }
    }
 
}

Программа должна распечатать следующий вывод на стандартный вывод:

Findbugs Sample 001 for BC_IMPOSSIBLE_CAST
   - ERROR:java.lang.Double cannot be cast to java.lang.Long
   - 1.0
Findbugs Sample 002 for BC_IMPOSSIBLE_DOWNCAST
   - ERROR:java.lang.RuntimeException cannot be cast to java.lang.SecurityException
   - abc
Findbugs Sample 003 for BC_IMPOSSIBLE_INSTANCEOF
   - false
   - true
Findbugs Sample 004 for BC_IMPOSSIBLE_DOWNCAST_OF_TOARRAY
   - ERROR:[Ljava.lang.Object; cannot be cast to [Ljava.lang.String;
   - 2
Findbugs Sample 005 for DMI_BIGDECIMAL_CONSTRUCTED_FROM_DOUBLE
   - 3.100000000000000088817841970012523233890533447265625
   - 3.1
Findbugs Sample 006 for ES_COMPARING_STRINGS_WITH_EQ
   - false
   - true
Findbugs Sample 007 for VA_FORMAT_STRING_ILLEGAL
   - ERROR:Conversion = '>'
   - 10 > 9
Findbugs Sample 008 for RV_RETURN_VALUE_IGNORED
   - 1
   - 2
Findbugs Sample 009 for NP_ALWAYS_NULL
   - ERROR:null
   - value is invalid
Findbugs Sample 010 for QBA_QUESTIONABLE_BOOLEAN_ASSIGNMENT
   - value is true
   - value is false

Пожалуйста, не стесняйтесь обращаться ко мне, если у вас есть идеи по улучшению и / или вы нашли ошибку в примере кода.

Мы продолжаем со следующими 5 предупреждениями:

DMI_CONSTANT_DB_PASSWORD (Безопасность)
DMI_EMPTY_DB_PASSWORD (Безопасность)
SQL_NONCONSTANT_STRING_PASSED_TO_EXECUTE (Безопасность)
OBL_UNSATISFIED_OBLIGATION (экспериментальный)
OBL_UNSATISFIED_OBLIGATION_EXCEPTION_EDGE (экспериментальный)

Мотивация для серии предупреждений Findbugs ™ по образцу

Образец кода

Findbugs ™ (версия 2.0.1-rc2) отобразит все предупреждения с активированными настройками «Безопасность» и «Экспериментальный» плагина Findbugs ™ Eclipse (версия 2.0.1.20120511). Смотрите следующий рисунок:

Образец был скомпилирован с использованием JDK 1.6.0_24 и derby.jar (версия 10.9.1.0) в пути сборки.

package com.sprunck.samples;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class FindbugsWarningsBySampleSecond {
 
    public static void main(final String[] args) {
 
        // Prepare database
        Statement createStatement = null;
        Connection connection = null;
        try {
            System.out.println("Findbugs Sample prepare small in memory database");
            connection = getConnection_dmiConstantDbPasswordCORRECT();
            createStatement = connection.createStatement();
            createStatement.execute("create table T_ADVICE (answer varchar(255), "
                    + "owner varchar(255))");
            createStatement.execute("insert into T_ADVICE ( answer, owner ) values "
                    + "('Don''t Panic', 'Joe')");
            createStatement.execute("insert into T_ADVICE ( answer, owner ) values "
                    + "('Keep Smiling', 'John')");
 
            System.out.println("\nFindbugs Sample for DMI_CONSTANT_DB_PASSWORD");
            // WRONG
            FindbugsWarningsBySampleSecond.getConnection_dmiConstantDbPasswordWRONG();
            // CORRECT
            FindbugsWarningsBySampleSecond.getConnection_dmiConstantDbPasswordCORRECT();
 
            System.out.println("\nFindbugs Sample for DMI_EMPTY_DB_PASSWORD");
            // WRONG
            FindbugsWarningsBySampleSecond.getConnection_dmiEmptyDbPasswordWRONG();
            // CORRECT
            FindbugsWarningsBySampleSecond.getConnection_dmiConstantDbPasswordCORRECT();
 
            System.out.println("\nFindbugs Sample for SQL_NONCONSTANT_STRING_PASSED_TO_EXECUTE");
            // WRONG
            FindbugsWarningsBySampleSecond.sqlNonconstantStringPassedToExecuteWRONG("Joe");
            // CORRECT
            FindbugsWarningsBySampleSecond.sqlNonconstantStringPassedToExecuteCORRECT("Joe");
 
            System.out.println("\nFindbugs Sample for OBL_UNSATISFIED_OBLIGATION");
            // WRONG
            FindbugsWarningsBySampleSecond.oblUnsatisfiedObligationWRONG("Joe");
            // CORRECT
            FindbugsWarningsBySampleSecond.oblUnsatisfiedObligationCORRECT("Joe");
 
            System.out.println("\nFindbugs Sample for OBL_UNSATISFIED_OBLIGATION_EXCEPTION_EDGE");
            // WRONG
            FindbugsWarningsBySampleSecond.oblUnsatisfiedObligationExceptionEdgeWRONG("Joe");
            // CORRECT
            FindbugsWarningsBySampleSecond.oblUnsatisfiedObligationExceptionEdgeCORRECT("Joe");
 
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != createStatement) {
                try {
                    createStatement.close();
                } catch (final SQLException e) {
                }
            }
            if (null != connection) {
                try {
                    connection.close();
                } catch (final SQLException e) {
                }
            }
 
        }
 
    }
 
    private static Connection getConnection_dmiConstantDbPasswordWRONG() throws SQLException {
 
        Connection connection = null;
        try {
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        } catch (final ClassNotFoundException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        connection = DriverManager.getConnection("jdbc:derby:memory:myDB;create=true", "APP",
                "my-secret-password");
        System.out.println("   - DriverManager.getConnection(\"jdbc:derby:database;"
                + "create=true\", \"test\", \"admin\"))");
 
        return connection;
    }
 
    private static Connection getConnection_dmiEmptyDbPasswordWRONG() throws SQLException {
 
        Connection connection = null;
        try {
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        } catch (final ClassNotFoundException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        connection = DriverManager.getConnection("jdbc:derby:memory:myDB;create=true", "APP", "");
        System.out.println("   - DriverManager.getConnection(\"jdbc:derby:database;create=true\","
                + " \"test\", \"\"))");
        return connection;
    }
 
    private static Connection getConnection_dmiConstantDbPasswordCORRECT() throws SQLException {
 
        Connection connection = null;
        try {
            Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        } catch (final ClassNotFoundException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        }
        connection = DriverManager.getConnection("jdbc:derby:memory:myDB;create=true", "APP",
                getSecurePassword());
        System.out.println("   - DriverManager.getConnection(\"jdbc:derby:database;"
                + "create=true\", \"test\", pwdDecoder()))");
        return connection;
    }
 
    static String getSecurePassword() {
        // Here we should fetch and decode the password from a secured resource
        return "my-sec" + "ret-password";
    }
 
    private static void sqlNonconstantStringPassedToExecuteWRONG(final String owner) {
 
        Statement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner= '" + owner + "'";
            statement = getConnection_dmiConstantDbPasswordCORRECT().createStatement();
            resultSet = statement.executeQuery(query);
            while (resultSet.next()) {
                System.out.println("   - Result (Statement):" + resultSet.getString("ANSWER"));
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
 
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (final SQLException e) {
                }
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
 
    private static void sqlNonconstantStringPassedToExecuteCORRECT(final String owner) {
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner = ?";
            statement = getConnection_dmiConstantDbPasswordCORRECT().prepareStatement(query);
            statement.setString(1, owner);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                System.out.println("   - Result (PreparedStatement):"
                        + resultSet.getString("ANSWER"));
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (final SQLException e) {
                }
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
 
    private static void oblUnsatisfiedObligationWRONG(final String owner) {
 
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner = ?";
            statement = getConnection_dmiConstantDbPasswordCORRECT().prepareStatement(query);
            statement.setString(1, owner);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                System.out.println("   - Result (PreparedStatement):"
                        + resultSet.getString("ANSWER"));
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
 
    private static void oblUnsatisfiedObligationCORRECT(final String owner) {
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner = ?";
            statement = getConnection_dmiConstantDbPasswordCORRECT().prepareStatement(query);
            statement.setString(1, owner);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                System.out.println("   - Result (PreparedStatement):"
                        + resultSet.getString("ANSWER"));
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (final SQLException e) {
                }
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
 
    private static void oblUnsatisfiedObligationExceptionEdgeWRONG(final String owner) {
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner = ?";
            statement = getConnection_dmiConstantDbPasswordCORRECT().prepareStatement(query);
            statement.setString(1, owner);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                System.out.println("   - Result (PreparedStatement):"
                        + resultSet.getString("ANSWER"));
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
 
    private static void oblUnsatisfiedObligationExceptionEdgeCORRECT(final String owner) {
        PreparedStatement statement = null;
        ResultSet resultSet = null;
        try {
            final String query = "SELECT answer FROM T_ADVICE WHERE owner = ?";
            statement = getConnection_dmiConstantDbPasswordCORRECT().prepareStatement(query);
            statement.setString(1, owner);
            resultSet = statement.executeQuery();
            while (resultSet.next()) {
                System.out.println("   - Result (PreparedStatement):"
                        + resultSet.getString("ANSWER"));
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        } catch (final SQLException e) {
            System.out.println("   - ERROR:" + e.getMessage());
        } finally {
            if (null != resultSet) {
                try {
                    resultSet.close();
                } catch (final SQLException e) {
                }
            }
            if (null != statement) {
                try {
                    statement.close();
                } catch (final SQLException e) {
                }
            }
        }
    }
}

Программа должна распечатать следующий вывод на стандартный вывод:

Findbugs Sample prepare small in memory database
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
 
Findbugs Sample for DMI_CONSTANT_DB_PASSWORD
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", "admin"))
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
 
Findbugs Sample for DMI_EMPTY_DB_PASSWORD
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", ""))
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
 
Findbugs Sample for SQL_NONCONSTANT_STRING_PASSED_TO_EXECUTE
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (Statement):Don't Panic
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (PreparedStatement):Don't Panic
 
Findbugs Sample for OBL_UNSATISFIED_OBLIGATION
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (PreparedStatement):Don't Panic
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (PreparedStatement):Don't Panic
 
Findbugs Sample for OBL_UNSATISFIED_OBLIGATION_EXCEPTION_EDGE
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (PreparedStatement):Don't Panic
   - DriverManager.getConnection("jdbc:derby:database;create=true", "test", pwdDecoder()))
   - Result (PreparedStatement):Don't Panic

Справка: предупреждения Findbugs ™ по образцу — часть I , Примеры предупреждений Findbugs ™ — часть II от нашего партнера по JCG Маркуса Шпрунка в блоге Software Engineering Candies .

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