apache/cassandra · error · InvalidTypeException

Value is of type , not

Error message

Value %s is of type %s, not %s

What it means

In the Cassandra Java driver's AbstractGettableByIndexData, checkType validates that the requested column's CQL type is compatible with the getter being used (get(i, X.class) or getX(i)). When the actual value's type is not compatible with the expected type, it throws InvalidTypeException with this message naming the column and both types.

Solutions

1. Use the getter matching the column's actual CQL type (getInt for int, getString for text, etc.)
2. Read the correct column index/name — verify with the SELECT statement or row.getColumnDefinitions()
3. After schema changes, rebuild prepared statements/metadata so row type info is fresh

Example fix

// before
String name = row.getString("age"); // age is int
// after
int age = row.getInt("age");

DataType.Name actual = row.getColumnDefinitions().getType(i).getName();
boolean safe = actual.isCompatibleWith(DataType.Name.TEXT); // check before getString(i)

static String safeGetString(Row row, int i) {
    if (row.getColumnDefinitions().getType(i).getName().isCompatibleWith(DataType.Name.TEXT)) {
        return row.getString(i);
    }
    return null;
}

try {
    return row.getString(i);
} catch (InvalidTypeException e) {
    // log row type metadata and use the matching getter
    return null;
}

When it happens

Trigger: Calling row.getString(0) on an int column, row.getInt(i) on a text column, or get(i, Float.class) on a double column; using stale Row metadata after a schema change (e.g. column altered from text to int).

Common situations: Schema evolution where column types changed after deployment; miscounting column indexes and hitting a different column than expected; casting results between result sets from differently typed queries.

Understand the failure class

Background: Type mismatch errors: IllegalArgumentException, TypeError and type guards across 150 open-source libraries — this error's family across 150 libraries.

Related errors

• Cannot assign value to of type
• Cannot assign value to of type
• Cannot cast value to type
• Cannot replace aggregate
• Cannot replace function

AI-assisted analysis of apache/cassandra@88fd0f6a0e (2026-09-10). Data as JSON: /api/errors/93fdae5b7b906220. Report an issue: GitHub.

Appendix: source

Thrown at src/java/org/apache/cassandra/cql3/functions/types/AbstractGettableByIndexData.java:98

    {
        return getCodecRegistry().codecFor(getType(i), javaClass);
    }

    protected <T> TypeCodec<T> codecFor(int i, TypeToken<T> javaType)
    {
        return getCodecRegistry().codecFor(getType(i), javaType);
    }

    protected <T> TypeCodec<T> codecFor(int i, T value)
    {
        return getCodecRegistry().codecFor(getType(i), value);
    }

    void checkType(int i, DataType.Name actual)
    {
        DataType.Name expected = getType(i).getName();
        if (!actual.isCompatibleWith(expected))
            throw new InvalidTypeException(
            String.format("Value %s is of type %s, not %s", getName(i), expected, actual));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean isNull(int i)
    {
        return getValue(i) == null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean getBool(int i)
    {

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